diff --git a/app/Commands/Dev/Asm/Compile.hs b/app/Commands/Dev/Asm/Compile.hs
index 7d178284b9..fcd77d6adf 100644
--- a/app/Commands/Dev/Asm/Compile.hs
+++ b/app/Commands/Dev/Asm/Compile.hs
@@ -11,8 +11,8 @@ import Juvix.Compiler.Reg.Pretty qualified as Reg
 runCommand :: forall r. (Members '[EmbedIO, App, TaggedLock] r) => AsmCompileOptions -> Sem r ()
 runCommand opts = do
   file <- getFile
-  s <- readFile (toFilePath file)
-  case Asm.runParser (toFilePath file) s of
+  s <- readFile file
+  case Asm.runParser file s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> do
       ep <- getEntryPoint (AppPath (preFileFromAbs file) True)
diff --git a/app/Commands/Dev/Asm/Run.hs b/app/Commands/Dev/Asm/Run.hs
index a0aec556d5..c813c6840b 100644
--- a/app/Commands/Dev/Asm/Run.hs
+++ b/app/Commands/Dev/Asm/Run.hs
@@ -8,8 +8,8 @@ import Juvix.Compiler.Asm.Translation.FromSource qualified as Asm
 runCommand :: forall r. (Members '[EmbedIO, App] r) => AsmRunOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Asm.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Asm.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> runAsm (not (opts ^. asmRunNoValidate)) tab
   where
diff --git a/app/Commands/Dev/Asm/Validate.hs b/app/Commands/Dev/Asm/Validate.hs
index feea835f5b..541549b772 100644
--- a/app/Commands/Dev/Asm/Validate.hs
+++ b/app/Commands/Dev/Asm/Validate.hs
@@ -9,8 +9,8 @@ import Juvix.Compiler.Asm.Translation.FromSource qualified as Asm
 runCommand :: forall r. (Members '[EmbedIO, App] r) => AsmValidateOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Asm.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Asm.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> do
       case Asm.validate' tab of
diff --git a/app/Commands/Dev/Casm/Read.hs b/app/Commands/Dev/Casm/Read.hs
index f240971b85..cc0008b999 100644
--- a/app/Commands/Dev/Casm/Read.hs
+++ b/app/Commands/Dev/Casm/Read.hs
@@ -9,8 +9,8 @@ import Juvix.Compiler.Casm.Validate qualified as Casm
 runCommand :: forall r. (Members '[EmbedIO, App] r) => CasmReadOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Casm.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Casm.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right (labi, code) ->
       case Casm.validate labi code of
diff --git a/app/Commands/Dev/Casm/Run.hs b/app/Commands/Dev/Casm/Run.hs
index 9095fddc04..3e56f25a7a 100644
--- a/app/Commands/Dev/Casm/Run.hs
+++ b/app/Commands/Dev/Casm/Run.hs
@@ -9,8 +9,8 @@ import Juvix.Compiler.Casm.Validate qualified as Casm
 runCommand :: forall r. (Members '[EmbedIO, App] r) => CasmRunOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Casm.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Casm.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right (labi, code) ->
       case Casm.validate labi code of
diff --git a/app/Commands/Dev/Core/Asm.hs b/app/Commands/Dev/Core/Asm.hs
index e0128dbd4f..5755bf21bc 100644
--- a/app/Commands/Dev/Core/Asm.hs
+++ b/app/Commands/Dev/Core/Asm.hs
@@ -10,7 +10,7 @@ runCommand :: forall r a. (Members '[EmbedIO, App, TaggedLock] r, CanonicalProje
 runCommand opts = do
   inputFile :: Path Abs File <- fromAppPathFile sinputFile
   ep <- getEntryPoint sinputFile
-  s' <- readFile $ toFilePath inputFile
+  s' <- readFile inputFile
   tab <- getRight (mapLeft JuvixError (Core.runParserMain inputFile defaultModuleId mempty s'))
   r <- runReader ep . runError @JuvixError $ coreToAsm (Core.moduleFromInfoTable tab)
   tab' <- getRight r
diff --git a/app/Commands/Dev/Core/Compile.hs b/app/Commands/Dev/Core/Compile.hs
index 32ecfc985d..912fb90d29 100644
--- a/app/Commands/Dev/Core/Compile.hs
+++ b/app/Commands/Dev/Core/Compile.hs
@@ -9,7 +9,7 @@ import Juvix.Compiler.Core.Translation.FromSource qualified as Core
 runCommand :: forall r. (Members '[EmbedIO, App, TaggedLock] r) => CompileOptions -> Sem r ()
 runCommand opts = do
   file <- getFile
-  s <- readFile (toFilePath file)
+  s <- readFile file
   tab <- getRight (mapLeft JuvixError (Core.runParserMain file defaultModuleId mempty s))
   let arg = PipelineArg opts file (Core.moduleFromInfoTable tab)
   case opts ^. compileTarget of
diff --git a/app/Commands/Dev/Core/Eval.hs b/app/Commands/Dev/Core/Eval.hs
index bf2c70b522..247dec4c24 100644
--- a/app/Commands/Dev/Core/Eval.hs
+++ b/app/Commands/Dev/Core/Eval.hs
@@ -8,7 +8,7 @@ import Juvix.Compiler.Core.Translation.FromSource qualified as Core
 runCommand :: forall r. (Members '[EmbedIO, App] r) => CoreEvalOptions -> Sem r ()
 runCommand opts = do
   f :: Path Abs File <- fromAppPathFile b
-  s <- readFile (toFilePath f)
+  s <- readFile f
   case Core.runParser f defaultModuleId mempty s of
     Left err -> exitJuvixError (JuvixError err)
     Right (tab, Just node) -> do evalAndPrint opts tab node
diff --git a/app/Commands/Dev/Core/Normalize.hs b/app/Commands/Dev/Core/Normalize.hs
index 44b6c48cf1..4970cf28c8 100644
--- a/app/Commands/Dev/Core/Normalize.hs
+++ b/app/Commands/Dev/Core/Normalize.hs
@@ -8,7 +8,7 @@ import Juvix.Compiler.Core.Translation.FromSource qualified as Core
 runCommand :: forall r. (Members '[EmbedIO, App] r) => CoreNormalizeOptions -> Sem r ()
 runCommand opts = do
   f :: Path Abs File <- fromAppPathFile b
-  s <- readFile (toFilePath f)
+  s <- readFile f
   case Core.runParser f defaultModuleId mempty s of
     Left err -> exitJuvixError (JuvixError err)
     Right (tab, Just node) -> do normalizeAndPrint opts tab node
diff --git a/app/Commands/Dev/Core/Read.hs b/app/Commands/Dev/Core/Read.hs
index c556bbe761..9d03e25427 100644
--- a/app/Commands/Dev/Core/Read.hs
+++ b/app/Commands/Dev/Core/Read.hs
@@ -22,7 +22,7 @@ runCommand ::
 runCommand opts = do
   gopts <- askGlobalOptions
   inputFile :: Path Abs File <- fromAppPathFile sinputFile
-  s' <- readFile . toFilePath $ inputFile
+  s' <- readFile inputFile
   tab <- getRight (mapLeft JuvixError (Core.runParserMain inputFile defaultModuleId mempty s'))
   let r = run $ runReader (project @GlobalOptions @Core.CoreOptions gopts) $ runError @JuvixError $ Core.applyTransformations (project opts ^. coreReadTransformations) (Core.moduleFromInfoTable tab)
   tab0 <- getRight $ mapLeft JuvixError r
diff --git a/app/Commands/Dev/Core/Repl.hs b/app/Commands/Dev/Core/Repl.hs
index 1007aed8c4..7752ee08bf 100644
--- a/app/Commands/Dev/Core/Repl.hs
+++ b/app/Commands/Dev/Core/Repl.hs
@@ -75,7 +75,7 @@ runRepl opts tab = do
           Right (tab', Nothing) ->
             runRepl opts tab'
       ':' : 'l' : ' ' : f -> do
-        s' <- readFile f
+        s' <- readFile (absFile f)
         sf <- someBaseToAbs' (someFile f)
         case Core.runParser sf defaultModuleId mempty s' of
           Left err -> do
diff --git a/app/Commands/Dev/Core/Strip.hs b/app/Commands/Dev/Core/Strip.hs
index 986ae69eb5..dd0b3dd53b 100644
--- a/app/Commands/Dev/Core/Strip.hs
+++ b/app/Commands/Dev/Core/Strip.hs
@@ -10,7 +10,7 @@ runCommand :: forall r a. (Members '[EmbedIO, App] r, CanonicalProjection a Core
 runCommand opts = do
   gopts <- askGlobalOptions
   inputFile :: Path Abs File <- fromAppPathFile sinputFile
-  s' <- readFile $ toFilePath inputFile
+  s' <- readFile inputFile
   (tab, _) <- getRight (mapLeft JuvixError (Core.runParser inputFile defaultModuleId mempty s'))
   let r =
         run $
diff --git a/app/Commands/Dev/Geb/Check.hs b/app/Commands/Dev/Geb/Check.hs
index 8522a4212a..5e4177ebe3 100644
--- a/app/Commands/Dev/Geb/Check.hs
+++ b/app/Commands/Dev/Geb/Check.hs
@@ -14,7 +14,7 @@ runCommand opts = do
   let b :: AppPath File
       b = opts ^. gebInferOptionsInputFile
   f :: Path Abs File <- fromAppPathFile b
-  content :: Text <- readFile (toFilePath f)
+  content :: Text <- readFile f
   case Geb.runParser f content of
     Right (Geb.ExpressionMorphism morph) -> do
       case Geb.inferObject' morph of
diff --git a/app/Commands/Dev/Geb/Eval.hs b/app/Commands/Dev/Geb/Eval.hs
index fe893a05f3..f06d815204 100644
--- a/app/Commands/Dev/Geb/Eval.hs
+++ b/app/Commands/Dev/Geb/Eval.hs
@@ -19,7 +19,7 @@ runCommand opts = do
   let b :: AppPath File
       b = project opts ^. gebEvalOptionsInputFile
   f :: Path Abs File <- fromAppPathFile b
-  content :: Text <- readFile (toFilePath f)
+  content :: Text <- readFile f
   case Geb.runParser f content of
     Left err -> exitJuvixError (JuvixError err)
     Right gebTerm -> do
diff --git a/app/Commands/Dev/Geb/Infer.hs b/app/Commands/Dev/Geb/Infer.hs
index 531607ef2c..14f3853342 100644
--- a/app/Commands/Dev/Geb/Infer.hs
+++ b/app/Commands/Dev/Geb/Infer.hs
@@ -13,7 +13,7 @@ runCommand opts = do
   let b :: AppPath File
       b = opts ^. gebInferOptionsInputFile
   f :: Path Abs File <- fromAppPathFile b
-  content :: Text <- readFile (toFilePath f)
+  content :: Text <- readFile f
   case Geb.runParser f content of
     Right (Geb.ExpressionMorphism gebTerm) ->
       case Geb.inferObject' gebTerm of
diff --git a/app/Commands/Dev/Geb/Read.hs b/app/Commands/Dev/Geb/Read.hs
index 501e87858e..db382f713b 100644
--- a/app/Commands/Dev/Geb/Read.hs
+++ b/app/Commands/Dev/Geb/Read.hs
@@ -14,7 +14,7 @@ runCommand opts = do
   let b :: AppPath File
       b = opts ^. gebReadOptionsInputFile
   f :: Path Abs File <- fromAppPathFile b
-  content :: Text <- readFile (toFilePath f)
+  content :: Text <- readFile f
   case Geb.runParser f content of
     Left err -> exitJuvixError (JuvixError err)
     Right gebTerm -> do
diff --git a/app/Commands/Dev/Geb/Repl.hs b/app/Commands/Dev/Geb/Repl.hs
index 8331774cb7..983e0dd31f 100644
--- a/app/Commands/Dev/Geb/Repl.hs
+++ b/app/Commands/Dev/Geb/Repl.hs
@@ -62,9 +62,8 @@ loadEntryPoint ep = do
     )
   let epPath :: Maybe (Path Abs File) = ep ^. entryPointModulePath
   whenJust epPath $ \path -> do
-    let filepath = toFilePath path
-    liftIO (putStrLn . pack $ "OK loaded " <> filepath)
-    content <- liftIO (readFile filepath)
+    liftIO (putStrLn . pack $ "OK loaded " <> toFilePath path)
+    content <- liftIO (readFile path)
     let evalRes =
           Geb.runEval $
             Geb.RunEvalArgs
diff --git a/app/Commands/Dev/Nockma/Eval.hs b/app/Commands/Dev/Nockma/Eval.hs
index 64f4e05407..65979e6b17 100644
--- a/app/Commands/Dev/Nockma/Eval.hs
+++ b/app/Commands/Dev/Nockma/Eval.hs
@@ -10,7 +10,7 @@ import Juvix.Compiler.Nockma.Translation.FromSource qualified as Nockma
 runCommand :: forall r. (Members '[EmbedIO, App] r) => NockmaEvalOptions -> Sem r ()
 runCommand opts = do
   afile <- fromAppPathFile file
-  parsedTerm <- Nockma.parseTermFile (toFilePath afile)
+  parsedTerm <- Nockma.parseTermFile afile
   case parsedTerm of
     Left err -> exitJuvixError (JuvixError err)
     Right (TermCell c) -> do
diff --git a/app/Commands/Dev/Nockma/Format.hs b/app/Commands/Dev/Nockma/Format.hs
index a3150f548e..48c702673b 100644
--- a/app/Commands/Dev/Nockma/Format.hs
+++ b/app/Commands/Dev/Nockma/Format.hs
@@ -8,7 +8,7 @@ import Juvix.Compiler.Nockma.Translation.FromSource qualified as Nockma
 runCommand :: forall r. (Members '[EmbedIO, App] r) => NockmaFormatOptions -> Sem r ()
 runCommand opts = do
   afile <- fromAppPathFile file
-  parsedTerm <- Nockma.parseTermFile (toFilePath afile)
+  parsedTerm <- Nockma.parseTermFile afile
   case parsedTerm of
     Left err -> exitJuvixError (JuvixError err)
     Right t -> putStrLn (ppPrint t)
diff --git a/app/Commands/Dev/Nockma/Repl.hs b/app/Commands/Dev/Nockma/Repl.hs
index 01751ef92d..0e6fd250ae 100644
--- a/app/Commands/Dev/Nockma/Repl.hs
+++ b/app/Commands/Dev/Nockma/Repl.hs
@@ -12,6 +12,7 @@ import Juvix.Compiler.Nockma.Pretty
 import Juvix.Compiler.Nockma.Pretty qualified as Nockma
 import Juvix.Compiler.Nockma.Translation.FromSource (parseProgramFile, parseReplStatement, parseReplText, parseText)
 import Juvix.Parser.Error
+import Juvix.Prelude qualified as Prelude
 import System.Console.Haskeline
 import System.Console.Repline qualified as Repline
 import Prelude (read)
@@ -21,7 +22,7 @@ type ReplS = State.StateT ReplState IO
 data ReplState = ReplState
   { _replStateProgram :: Maybe (Program Natural),
     _replStateStack :: Maybe (Term Natural),
-    _replStateLoadedFile :: Maybe (FilePath)
+    _replStateLoadedFile :: Maybe (Prelude.Path Abs File)
   }
 
 type Repl a = Repline.HaskelineT ReplS a
@@ -62,7 +63,7 @@ setStack s = Repline.dontCrash $ do
   newStack <- readReplTerm s
   State.modify (set replStateStack (Just newStack))
 
-loadFile :: String -> Repl ()
+loadFile :: Prelude.Path Abs File -> Repl ()
 loadFile s = Repline.dontCrash $ do
   State.modify (set replStateLoadedFile (Just s))
   prog <- readProgram s
@@ -82,7 +83,7 @@ options =
   [ ("quit", quit),
     ("get-stack", printStack),
     ("set-stack", setStack),
-    ("load", loadFile),
+    ("load", loadFile . Prelude.absFile),
     ("reload", const reloadFile),
     ("dir", direction')
   ]
@@ -98,7 +99,7 @@ getStack = State.gets (^. replStateStack)
 getProgram :: Repl (Maybe (Program Natural))
 getProgram = State.gets (^. replStateProgram)
 
-readProgram :: FilePath -> Repl (Program Natural)
+readProgram :: Prelude.Path Abs File -> Repl (Program Natural)
 readProgram s = fromMegaParsecError <$> parseProgramFile s
 
 direction' :: String -> Repl ()
diff --git a/app/Commands/Dev/Reg/Read.hs b/app/Commands/Dev/Reg/Read.hs
index 0c6e1e7fd4..f8a86ebe5f 100644
--- a/app/Commands/Dev/Reg/Read.hs
+++ b/app/Commands/Dev/Reg/Read.hs
@@ -10,8 +10,8 @@ import RegInterpreter
 runCommand :: forall r. (Members '[EmbedIO, App] r) => RegReadOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Reg.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Reg.runParser afile s of
     Left err ->
       exitJuvixError (JuvixError err)
     Right tab -> do
diff --git a/app/Commands/Dev/Reg/Run.hs b/app/Commands/Dev/Reg/Run.hs
index d2655d6107..b4270c49d7 100644
--- a/app/Commands/Dev/Reg/Run.hs
+++ b/app/Commands/Dev/Reg/Run.hs
@@ -8,8 +8,8 @@ import RegInterpreter
 runCommand :: forall r. (Members '[Embed IO, App] r) => RegRunOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Reg.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Reg.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> runReg tab
   where
diff --git a/app/Commands/Dev/Tree/Compile.hs b/app/Commands/Dev/Tree/Compile.hs
index dfdded0bc6..f63f352c96 100644
--- a/app/Commands/Dev/Tree/Compile.hs
+++ b/app/Commands/Dev/Tree/Compile.hs
@@ -8,8 +8,8 @@ import Juvix.Compiler.Tree.Translation.FromSource qualified as Tree
 runCommand :: forall r. (Members '[EmbedIO, App, TaggedLock] r) => CompileOptions -> Sem r ()
 runCommand opts = do
   file <- getFile
-  s <- readFile (toFilePath file)
-  tab <- getRight (mapLeft JuvixError (Tree.runParser (toFilePath file) s))
+  s <- readFile file
+  tab <- getRight (mapLeft JuvixError (Tree.runParser file s))
   let arg = PipelineArg opts file tab
   case opts ^. compileTarget of
     TargetWasm32Wasi -> runCPipeline arg
diff --git a/app/Commands/Dev/Tree/Eval.hs b/app/Commands/Dev/Tree/Eval.hs
index b43f5a4baf..e603889a55 100644
--- a/app/Commands/Dev/Tree/Eval.hs
+++ b/app/Commands/Dev/Tree/Eval.hs
@@ -8,8 +8,8 @@ import TreeEvaluator
 runCommand :: forall r. (Members '[EmbedIO, App] r) => TreeEvalOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Tree.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Tree.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> evalTree (opts ^. treeEvalEvaluator) tab
   where
diff --git a/app/Commands/Dev/Tree/FromAsm.hs b/app/Commands/Dev/Tree/FromAsm.hs
index 23f089737c..31028ca480 100644
--- a/app/Commands/Dev/Tree/FromAsm.hs
+++ b/app/Commands/Dev/Tree/FromAsm.hs
@@ -11,8 +11,8 @@ import Juvix.Compiler.Tree.Translation.FromAsm qualified as Tree
 runCommand :: forall r. (Members '[EmbedIO, App] r) => TreeFromAsmOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Asm.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Asm.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> do
       r :: Either JuvixError Tree.InfoTable <- runError $ mapError (JuvixError @TreeError) $ Tree.fromAsm tab
diff --git a/app/Commands/Dev/Tree/Read.hs b/app/Commands/Dev/Tree/Read.hs
index 05fec105be..8f8a9e36fa 100644
--- a/app/Commands/Dev/Tree/Read.hs
+++ b/app/Commands/Dev/Tree/Read.hs
@@ -11,8 +11,8 @@ import TreeEvaluator qualified as Eval
 runCommand :: forall r. (Members '[EmbedIO, App] r) => TreeReadOptions -> Sem r ()
 runCommand opts = do
   afile :: Path Abs File <- fromAppPathFile file
-  s <- readFile (toFilePath afile)
-  case Tree.runParser (toFilePath afile) s of
+  s <- readFile afile
+  case Tree.runParser afile s of
     Left err -> exitJuvixError (JuvixError err)
     Right tab -> do
       r <- runError @JuvixError (Tree.applyTransformations (project opts ^. treeReadTransformations) tab)
diff --git a/app/Commands/Dev/Tree/Repl.hs b/app/Commands/Dev/Tree/Repl.hs
index 296eec39fb..a3d4a5241a 100644
--- a/app/Commands/Dev/Tree/Repl.hs
+++ b/app/Commands/Dev/Tree/Repl.hs
@@ -18,7 +18,7 @@ type ReplS = State.StateT ReplState IO
 
 data ReplState = ReplState
   { _replStateBuilderState :: Tree.BuilderState,
-    _replStateLoadedFile :: Maybe FilePath
+    _replStateLoadedFile :: Maybe (Path Abs File)
   }
 
 type Repl a = Repline.HaskelineT ReplS a
@@ -40,7 +40,7 @@ printHelpTxt = liftIO $ putStrLn helpTxt
 quit :: String -> Repl ()
 quit _ = liftIO (throwIO Interrupt)
 
-loadFile :: String -> Repl ()
+loadFile :: Path Abs File -> Repl ()
 loadFile s = Repline.dontCrash $ do
   State.modify (set replStateLoadedFile (Just s))
   readProgram s
@@ -52,7 +52,7 @@ reloadFile = Repline.dontCrash $ do
     Nothing -> error "no file loaded"
     Just f -> readProgram f
 
-readProgram :: FilePath -> Repl ()
+readProgram :: Path Abs File -> Repl ()
 readProgram f = do
   bs <- State.gets (^. replStateBuilderState)
   txt <- readFile f
@@ -65,7 +65,7 @@ options :: [(String, String -> Repl ())]
 options =
   [ ("help", Repline.dontCrash . const printHelpTxt),
     ("quit", quit),
-    ("load", loadFile),
+    ("load", loadFile . absFile),
     ("reload", const reloadFile)
   ]
 
@@ -83,8 +83,8 @@ readNode s = do
       State.modify (set replStateBuilderState bs')
       return n
   where
-    replFile :: FilePath
-    replFile = "<file>"
+    replFile :: Path Abs File
+    replFile = $(mkAbsFile "/<repl>")
 
 evalNode :: Node -> Repl ()
 evalNode node = do
diff --git a/bench/Main.hs b/bench/Main.hs
index 7a3e64f242..436c9876bf 100644
--- a/bench/Main.hs
+++ b/bench/Main.hs
@@ -99,7 +99,7 @@ csvRules s =
     csv :: Path Abs File = suiteCsvFile s
     addColorColumn :: IO ()
     addColorColumn = do
-      header :| rows <- nonEmpty' . Text.lines <$> readFile (toFilePath csv)
+      header :| rows <- nonEmpty' . Text.lines <$> readFile csv
       let rows' =
             [ showColour (v ^. variantColor) <> "," <> r
               | (v, r) <- zipExact (s ^. suiteVariants) rows
diff --git a/src/Juvix/Compiler/Asm/Translation/FromSource.hs b/src/Juvix/Compiler/Asm/Translation/FromSource.hs
index 9d7e95480e..c2788b790d 100644
--- a/src/Juvix/Compiler/Asm/Translation/FromSource.hs
+++ b/src/Juvix/Compiler/Asm/Translation/FromSource.hs
@@ -31,16 +31,19 @@ parseAsmSig =
       _parserSigEmptyExtra = mempty
     }
 
+noFile :: Path Abs File
+noFile = $(mkAbsFile "/<text>")
+
 parseText :: Text -> Either MegaparsecError InfoTable
-parseText = runParser ""
+parseText = runParser noFile
 
 parseText' :: BuilderState -> Text -> Either MegaparsecError BuilderState
-parseText' bs = runParser' bs ""
+parseText' bs = runParser' bs noFile
 
-runParser :: FilePath -> Text -> Either MegaparsecError InfoTable
+runParser :: Path Abs File -> Text -> Either MegaparsecError InfoTable
 runParser = runParserS parseAsmSig
 
-runParser' :: BuilderState -> FilePath -> Text -> Either MegaparsecError BuilderState
+runParser' :: BuilderState -> Path Abs File -> Text -> Either MegaparsecError BuilderState
 runParser' = runParserS' parseAsmSig
 
 parseCode ::
diff --git a/src/Juvix/Compiler/Casm/Translation/FromSource.hs b/src/Juvix/Compiler/Casm/Translation/FromSource.hs
index e1d96eb61a..5f93ebeea6 100644
--- a/src/Juvix/Compiler/Casm/Translation/FromSource.hs
+++ b/src/Juvix/Compiler/Casm/Translation/FromSource.hs
@@ -9,11 +9,11 @@ import Juvix.Parser.Error
 import Text.Megaparsec qualified as P
 
 parseText :: Text -> Either MegaparsecError (LabelInfo, [Instruction])
-parseText = runParser ""
+parseText = runParser $(mkAbsFile "/<text>")
 
-runParser :: FilePath -> Text -> Either MegaparsecError (LabelInfo, [Instruction])
+runParser :: Path Abs File -> Text -> Either MegaparsecError (LabelInfo, [Instruction])
 runParser fileName input_ =
-  case run $ runLabelInfoBuilder $ P.runParserT parseToplevel fileName input_ of
+  case run . runLabelInfoBuilder $ P.runParserT parseToplevel (toFilePath fileName) input_ of
     (_, Left err) -> Left (MegaparsecError err)
     (li, Right instrs) -> Right (li, instrs)
 
diff --git a/src/Juvix/Compiler/Nockma/Translation/FromSource/Base.hs b/src/Juvix/Compiler/Nockma/Translation/FromSource/Base.hs
index 8ed058b290..0e7d161a0e 100644
--- a/src/Juvix/Compiler/Nockma/Translation/FromSource/Base.hs
+++ b/src/Juvix/Compiler/Nockma/Translation/FromSource/Base.hs
@@ -8,6 +8,7 @@ import Juvix.Extra.Strings qualified as Str
 import Juvix.Parser.Error
 import Juvix.Parser.Lexer (onlyInterval, withLoc)
 import Juvix.Prelude hiding (Atom, Path, many, some)
+import Juvix.Prelude qualified as Prelude
 import Juvix.Prelude.Parsing hiding (runParser)
 import Text.Megaparsec qualified as P
 import Text.Megaparsec.Char.Lexer qualified as L
@@ -20,12 +21,12 @@ parseText = runParser noFile
 parseReplText :: Text -> Either MegaparsecError (ReplTerm Natural)
 parseReplText = runParserFor replTerm noFile
 
-parseTermFile :: (MonadIO m) => FilePath -> m (Either MegaparsecError (Term Natural))
+parseTermFile :: (MonadIO m) => Prelude.Path Abs File -> m (Either MegaparsecError (Term Natural))
 parseTermFile fp = do
   txt <- readFile fp
   return (runParser fp txt)
 
-parseProgramFile :: (MonadIO m) => FilePath -> m (Either MegaparsecError (Program Natural))
+parseProgramFile :: (MonadIO m) => Prelude.Path Abs File -> m (Either MegaparsecError (Program Natural))
 parseProgramFile fp = do
   txt <- readFile fp
   return (runParserProgram fp txt)
@@ -33,18 +34,18 @@ parseProgramFile fp = do
 parseReplStatement :: Text -> Either MegaparsecError (ReplStatement Natural)
 parseReplStatement = runParserFor replStatement noFile
 
-noFile :: FilePath
-noFile = "/<text>"
+noFile :: Prelude.Path Abs File
+noFile = $(mkAbsFile "/<text>")
 
-runParserProgram :: FilePath -> Text -> Either MegaparsecError (Program Natural)
+runParserProgram :: Prelude.Path Abs File -> Text -> Either MegaparsecError (Program Natural)
 runParserProgram = runParserFor program
 
-runParserFor :: Parser a -> FilePath -> Text -> Either MegaparsecError a
-runParserFor p f input_ = case P.runParser (spaceConsumer >> p <* eof) f input_ of
+runParserFor :: Parser a -> Prelude.Path Abs File -> Text -> Either MegaparsecError a
+runParserFor p f input_ = case P.runParser (spaceConsumer >> p <* eof) (toFilePath f) input_ of
   Left err -> Left (MegaparsecError err)
   Right t -> Right t
 
-runParser :: FilePath -> Text -> Either MegaparsecError (Term Natural)
+runParser :: Prelude.Path Abs File -> Text -> Either MegaparsecError (Term Natural)
 runParser = runParserFor term
 
 spaceConsumer :: Parser ()
diff --git a/src/Juvix/Compiler/Reg/Translation/FromSource.hs b/src/Juvix/Compiler/Reg/Translation/FromSource.hs
index 28451384e8..9537f36247 100644
--- a/src/Juvix/Compiler/Reg/Translation/FromSource.hs
+++ b/src/Juvix/Compiler/Reg/Translation/FromSource.hs
@@ -30,16 +30,19 @@ parseRegSig =
       _parserSigEmptyExtra = ()
     }
 
+noFile :: Path Abs File
+noFile = $(mkAbsFile "/<text>")
+
 parseText :: Text -> Either MegaparsecError InfoTable
-parseText = runParser ""
+parseText = runParser noFile
 
 parseText' :: BuilderState -> Text -> Either MegaparsecError BuilderState
-parseText' bs = runParser' bs ""
+parseText' bs = runParser' bs noFile
 
-runParser :: FilePath -> Text -> Either MegaparsecError InfoTable
+runParser :: Path Abs File -> Text -> Either MegaparsecError InfoTable
 runParser = runParserS parseRegSig
 
-runParser' :: BuilderState -> FilePath -> Text -> Either MegaparsecError BuilderState
+runParser' :: BuilderState -> Path Abs File -> Text -> Either MegaparsecError BuilderState
 runParser' = runParserS' parseRegSig
 
 parseCode ::
diff --git a/src/Juvix/Compiler/Tree/Translation/FromSource.hs b/src/Juvix/Compiler/Tree/Translation/FromSource.hs
index 9c3e2f599b..fe48036493 100644
--- a/src/Juvix/Compiler/Tree/Translation/FromSource.hs
+++ b/src/Juvix/Compiler/Tree/Translation/FromSource.hs
@@ -31,19 +31,22 @@ parseTreeSig =
       _parserSigEmptyExtra = ()
     }
 
+noFile :: Path Abs File
+noFile = $(mkAbsFile "/<text")
+
 parseText :: Text -> Either MegaparsecError InfoTable
-parseText = runParser ""
+parseText = runParser noFile
 
 parseText' :: BuilderState -> Text -> Either MegaparsecError BuilderState
-parseText' bs = runParser' bs ""
+parseText' bs = runParser' bs noFile
 
-runParser :: FilePath -> Text -> Either MegaparsecError InfoTable
+runParser :: Path Abs File -> Text -> Either MegaparsecError InfoTable
 runParser = runParserS parseTreeSig
 
-runParser' :: BuilderState -> FilePath -> Text -> Either MegaparsecError BuilderState
+runParser' :: BuilderState -> Path Abs File -> Text -> Either MegaparsecError BuilderState
 runParser' = runParserS' parseTreeSig
 
-parseNodeText' :: BuilderState -> FilePath -> Text -> Either MegaparsecError (BuilderState, Node)
+parseNodeText' :: BuilderState -> Path Abs File -> Text -> Either MegaparsecError (BuilderState, Node)
 parseNodeText' bs file txt = runParserS'' parseNode parseTreeSig bs file txt
 
 parseNode ::
diff --git a/src/Juvix/Compiler/Tree/Translation/FromSource/Base.hs b/src/Juvix/Compiler/Tree/Translation/FromSource/Base.hs
index 2f610ef0e7..b9448e10bd 100644
--- a/src/Juvix/Compiler/Tree/Translation/FromSource/Base.hs
+++ b/src/Juvix/Compiler/Tree/Translation/FromSource/Base.hs
@@ -37,10 +37,10 @@ localS update a = do
   lift $ put s
   return a'
 
-runParserS :: ParserSig t e d -> FilePath -> Text -> Either MegaparsecError (InfoTable' t e)
+runParserS :: ParserSig t e d -> Path Abs File -> Text -> Either MegaparsecError (InfoTable' t e)
 runParserS sig fileName input_ = (^. stateInfoTable) <$> runParserS' sig emptyBuilderState fileName input_
 
-runParserS' :: forall t e d. ParserSig t e d -> BuilderState' t e -> FilePath -> Text -> Either MegaparsecError (BuilderState' t e)
+runParserS' :: forall t e d. ParserSig t e d -> BuilderState' t e -> Path Abs File -> Text -> Either MegaparsecError (BuilderState' t e)
 runParserS' sig bs fileName input_ = case runParserS'' (parseToplevel @t @e @d) sig bs fileName input_ of
   Left e -> Left e
   Right (bs', ()) -> Right bs'
@@ -50,15 +50,15 @@ runParserS'' ::
   ParsecS '[Reader (ParserSig t e d), InfoTableBuilder' t e, State (LocalParams' d)] a ->
   ParserSig t e d ->
   BuilderState' t e ->
-  FilePath ->
+  Path Abs File ->
   Text ->
   Either MegaparsecError (BuilderState' t e, a)
 runParserS'' parser sig bs fileName input_ =
-  case run $
-    evalState emptyLocalParams $
-      runInfoTableBuilder' bs $
-        runReader sig $
-          P.runParserT parser fileName input_ of
+  case run
+    . evalState emptyLocalParams
+    . runInfoTableBuilder' bs
+    . runReader sig
+    $ P.runParserT parser (toFilePath fileName) input_ of
     (_, Left err) -> Left (MegaparsecError err)
     (bs', Right x) -> Right (bs', x)
 
diff --git a/src/Juvix/Data/Effect/Files/IO.hs b/src/Juvix/Data/Effect/Files/IO.hs
index a830fd6649..517a5014cf 100644
--- a/src/Juvix/Data/Effect/Files/IO.hs
+++ b/src/Juvix/Data/Effect/Files/IO.hs
@@ -30,7 +30,7 @@ runFilesIO = interpret helper
 
     helper' :: forall rInitial x. Files (Sem rInitial) x -> IO x
     helper' = \case
-      ReadFile' f -> readFile (toFilePath f)
+      ReadFile' f -> readFile f
       WriteFileBS p bs -> ByteString.writeFile (toFilePath p) bs
       WriteFileEnsureLn' f txt -> writeFileEnsureLn f txt
       EnsureDir' p -> Path.ensureDir p
diff --git a/src/Juvix/Prelude/Base.hs b/src/Juvix/Prelude/Base.hs
index 135e268ebf..bcb51f5c36 100644
--- a/src/Juvix/Prelude/Base.hs
+++ b/src/Juvix/Prelude/Base.hs
@@ -606,10 +606,9 @@ ensureLn t =
       '\n' -> t
       _ -> Text.snoc t '\n'
 
+readFile :: (MonadIO m) => Path Abs File -> m Text
+readFile = liftIO . Utf8.readFile . toFilePath
+
 writeFileEnsureLn :: (MonadIO m) => Path Abs File -> Text -> m ()
 writeFileEnsureLn p = liftIO . Utf8.writeFile (toFilePath p)
 {-# INLINE writeFileEnsureLn #-}
-
--- TODO: change FilePath to Path Abs File
-readFile :: (MonadIO m) => FilePath -> m Text
-readFile = liftIO . Utf8.readFile
diff --git a/test/Asm/Compile/Base.hs b/test/Asm/Compile/Base.hs
index 88d5caa15d..71d2e24d65 100644
--- a/test/Asm/Compile/Base.hs
+++ b/test/Asm/Compile/Base.hs
@@ -35,7 +35,7 @@ asmCompileAssertion' optLevel tab mainFile expectedFile stdinText step = do
 asmCompileAssertion :: Path Abs File -> Path Abs File -> Text -> (String -> IO ()) -> Assertion
 asmCompileAssertion mainFile expectedFile stdinText step = do
   step "Parse"
-  s <- readFile (toFilePath mainFile)
-  case runParser (toFilePath mainFile) s of
+  s <- readFile mainFile
+  case runParser mainFile s of
     Left err -> assertFailure (show err)
     Right tab -> asmCompileAssertion' 3 tab mainFile expectedFile stdinText step
diff --git a/test/Asm/Run/Base.hs b/test/Asm/Run/Base.hs
index 7ce0ff927c..9ae0493cad 100644
--- a/test/Asm/Run/Base.hs
+++ b/test/Asm/Run/Base.hs
@@ -39,9 +39,9 @@ asmRunAssertionParam' interpretFun tab expectedFile step = do
                 step "Interpret"
                 interpretFun hout sym tab
                 hClose hout
-                actualOutput <- readFile (toFilePath outputFile)
+                actualOutput <- readFile outputFile
                 step "Compare expected and actual program output"
-                expected <- readFile (toFilePath expectedFile)
+                expected <- readFile expectedFile
                 assertEqDiffText ("Check: RUN output = " <> toFilePath expectedFile) actualOutput expected
             )
         Nothing -> assertFailure "no 'main' function"
@@ -90,9 +90,8 @@ asmRunErrorAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError InfoTable)
 parseFile f = do
-  let f' = toFilePath f
-  s <- readFile f'
-  return $ runParser f' s
+  s <- readFile f
+  return (runParser f s)
 
 doRun ::
   Handle ->
diff --git a/test/Asm/Validate/Base.hs b/test/Asm/Validate/Base.hs
index f3ed503248..9348879896 100644
--- a/test/Asm/Validate/Base.hs
+++ b/test/Asm/Validate/Base.hs
@@ -19,5 +19,5 @@ asmValidateErrorAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError InfoTable)
 parseFile f = do
-  s <- readFile (toFilePath f)
-  return $ runParser (toFilePath f) s
+  s <- readFile f
+  return (runParser f s)
diff --git a/test/BackendGeb/Eval/Base.hs b/test/BackendGeb/Eval/Base.hs
index a978068a41..61e2521ec5 100644
--- a/test/BackendGeb/Eval/Base.hs
+++ b/test/BackendGeb/Eval/Base.hs
@@ -11,7 +11,7 @@ gebEvalAssertion ::
   Assertion
 gebEvalAssertion mainFile expectedFile step = do
   step "Parse"
-  input_ <- readFile (toFilePath mainFile)
+  input_ <- readFile mainFile
   case Geb.runParser mainFile input_ of
     Left err -> assertFailure (show (pretty err))
     Right (Geb.ExpressionObject _) -> do
@@ -51,8 +51,8 @@ gebEvalAssertion' _mainFile expectedFile step gebMorphism = do
         Right value -> do
           hPutStrLn hout (Geb.ppPrint value)
           hClose hout
-          actualOutput <- readFile (toFilePath outputFile)
-          expected <- readFile (toFilePath expectedFile)
+          actualOutput <- readFile outputFile
+          expected <- readFile expectedFile
           step "Compare expected and actual program output"
           assertEqDiffText
             ("Check: EVAL output = " <> toFilePath expectedFile)
@@ -62,7 +62,7 @@ gebEvalAssertion' _mainFile expectedFile step gebMorphism = do
 gebEvalErrorAssertion :: Path Abs File -> (String -> IO ()) -> Assertion
 gebEvalErrorAssertion mainFile step = do
   step "Parse"
-  input_ <- readFile (toFilePath mainFile)
+  input_ <- readFile mainFile
   case Geb.runParser mainFile input_ of
     Left _ -> assertBool "" True
     Right (Geb.ExpressionObject _) -> assertFailure "no error"
diff --git a/test/BackendGeb/FromCore/Base.hs b/test/BackendGeb/FromCore/Base.hs
index 4034ff9d56..3aa958a7a6 100644
--- a/test/BackendGeb/FromCore/Base.hs
+++ b/test/BackendGeb/FromCore/Base.hs
@@ -16,7 +16,7 @@ coreToGebTranslationAssertion ::
   Assertion
 coreToGebTranslationAssertion root mainFile expectedFile step = do
   step "Parse Juvix Core file"
-  input_ <- readFile . toFilePath $ mainFile
+  input_ <- readFile mainFile
   entryPoint <- set entryPointTarget TargetGeb <$> testDefaultEntryPointIO root mainFile
   case Core.runParserMain mainFile defaultModuleId mempty input_ of
     Left err -> assertFailure . show . pretty $ err
@@ -72,8 +72,7 @@ coreToGebTranslationAssertion' coreInfoTable entryPoint expectedFile step = do
                           | resEvalTranslatedMorph /= resEvalGebCoreEvalResult ->
                               assertFailure "The evaluation for the Core node and the Geb node are not equal"
                           | otherwise -> do
-                              let fpath = toFilePath expectedFile
-                              expectedInput <- readFile fpath
+                              expectedInput <- readFile expectedFile
                               step "Compare expected and actual program output"
                               let compareEvalOutput morph =
                                     if
diff --git a/test/BackendMarkdown/Positive.hs b/test/BackendMarkdown/Positive.hs
index 24af613775..c3096fc138 100644
--- a/test/BackendMarkdown/Positive.hs
+++ b/test/BackendMarkdown/Positive.hs
@@ -55,7 +55,7 @@ testDescr PosTest {..} =
           Left err -> assertFailure (show err)
           Right md -> do
             step "Checking against expected output file"
-            expFile :: Text <- readFile (toFilePath _expectedFile)
+            expFile :: Text <- readFile _expectedFile
             assertEqDiffText "Compare to expected output" md expFile
     }
 
diff --git a/test/Casm/Run/Base.hs b/test/Casm/Run/Base.hs
index a9c3f3e15b..35a177719a 100644
--- a/test/Casm/Run/Base.hs
+++ b/test/Casm/Run/Base.hs
@@ -26,9 +26,9 @@ casmRunAssertion' labi instrs expectedFile step =
                 hout <- openFile (toFilePath outputFile) WriteMode
                 hPrint hout value'
                 hClose hout
-                actualOutput <- readFile (toFilePath outputFile)
+                actualOutput <- readFile outputFile
                 step "Compare expected and actual program output"
-                expected <- readFile (toFilePath expectedFile)
+                expected <- readFile expectedFile
                 assertEqDiffText ("Check: RUN output = " <> toFilePath expectedFile) actualOutput expected
         )
 
@@ -59,9 +59,8 @@ casmRunErrorAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError (LabelInfo, Code))
 parseFile f = do
-  let f' = toFilePath f
-  s <- readFile f'
-  return $ runParser f' s
+  s <- readFile f
+  return (runParser f s)
 
 doRun ::
   LabelInfo ->
diff --git a/test/Core/Asm/Base.hs b/test/Core/Asm/Base.hs
index 786cf22bdf..521530031a 100644
--- a/test/Core/Asm/Base.hs
+++ b/test/Core/Asm/Base.hs
@@ -47,7 +47,7 @@ coreAsmAssertion mainFile expectedFile step = do
     Left err -> assertFailure (show (pretty err))
     Right (_, Nothing) -> do
       step "Empty program: compare expected and actual program output"
-      expected <- readFile (toFilePath expectedFile)
+      expected <- readFile expectedFile
       assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) "" expected
     Right (tabIni, Just node) -> do
       step "Translate"
diff --git a/test/Core/Compile/Base.hs b/test/Core/Compile/Base.hs
index dcfd30267e..dd6f67384e 100644
--- a/test/Core/Compile/Base.hs
+++ b/test/Core/Compile/Base.hs
@@ -72,7 +72,7 @@ coreCompileAssertion mainFile expectedFile stdinText step = do
     Left err -> assertFailure (show (pretty err))
     Right (_, Nothing) -> do
       step "Empty program: compare expected and actual program output"
-      expected <- readFile (toFilePath expectedFile)
+      expected <- readFile expectedFile
       assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) "" expected
     Right (tabIni, Just node) ->
       coreCompileAssertion' 3 (setupMainFunction defaultModuleId tabIni node) mainFile expectedFile stdinText step
diff --git a/test/Core/Eval/Base.hs b/test/Core/Eval/Base.hs
index 7c7c377e34..4c109990fb 100644
--- a/test/Core/Eval/Base.hs
+++ b/test/Core/Eval/Base.hs
@@ -76,7 +76,7 @@ coreEvalAssertion' mode tab mainFile expectedFile step =
                         (Info.member kNoDisplayInfo (getInfo value))
                         (hPutStrLn hout (ppPrint (toValue tab value)))
                       hClose hout
-                      actualOutput <- readFile (toFilePath outputFile)
+                      actualOutput <- readFile outputFile
                       step "Compare expected and actual program output"
                       assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) actualOutput _evalDataOutput
               )
@@ -101,7 +101,7 @@ coreEvalAssertion' mode tab mainFile expectedFile step =
     readEvalData :: [Maybe Text] -> IO (Either String EvalData)
     readEvalData argnames = case mode of
       EvalModePlain -> do
-        expected <- readFile (toFilePath expectedFile)
+        expected <- readFile expectedFile
         return $
           Right $
             EvalData
@@ -146,7 +146,7 @@ coreEvalAssertion mainFile expectedFile trans testTrans step = do
     Left err -> assertFailure (show (pretty err))
     Right (_, Nothing) -> do
       step "Compare expected and actual program output"
-      expected <- readFile (toFilePath expectedFile)
+      expected <- readFile expectedFile
       assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) "" expected
     Right (tabIni, Just node) ->
       case run $ runReader defaultCoreOptions $ runError $ applyTransformations trans $ moduleFromInfoTable $ setupMainFunction defaultModuleId tabIni node of
@@ -179,9 +179,8 @@ coreEvalErrorAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError (InfoTable, Maybe Node))
 parseFile f = do
-  let f' = toFilePath f
-  s <- readFile f'
-  return $ runParser f defaultModuleId mempty s
+  s <- readFile f
+  return (runParser f defaultModuleId mempty s)
 
 doEval' ::
   EvalOptions ->
diff --git a/test/Core/Print/Base.hs b/test/Core/Print/Base.hs
index 3564d4bb5d..8c55933422 100644
--- a/test/Core/Print/Base.hs
+++ b/test/Core/Print/Base.hs
@@ -42,7 +42,7 @@ corePrintAssertion mainFile expectedFile step = do
     Left err -> assertFailure (show (pretty err))
     Right (_, Nothing) -> do
       step "Empty program: compare expected and actual program output"
-      expected <- readFile (toFilePath expectedFile)
+      expected <- readFile expectedFile
       assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) "" expected
     Right (tabIni, Just node) -> do
       let m = disambiguateNames (moduleFromInfoTable $ setupMainFunction defaultModuleId tabIni node)
diff --git a/test/Format.hs b/test/Format.hs
index c599c80472..47b6d22c2c 100644
--- a/test/Format.hs
+++ b/test/Format.hs
@@ -33,7 +33,7 @@ testDescr PosTest {..} =
         let maybeFile = entryPoint ^. entryPointModulePath
         f <- fromMaybeM (assertFailure "Not a module") (return maybeFile)
 
-        original :: Text <- readFile (toFilePath f)
+        original :: Text <- readFile f
 
         step "Parsing & scoping"
         PipelineResult {..} <- snd <$> testRunIO entryPoint upToScoping
@@ -45,7 +45,7 @@ testDescr PosTest {..} =
             assertEqDiffText "check: pretty . scope . parse = id" original formatted
           Just eFile -> do
             step "Checking against expected output file"
-            expFile :: Text <- readFile (toFilePath eFile)
+            expFile :: Text <- readFile eFile
             assertEqDiffText "Compare to expected output" formatted expFile
     }
 
diff --git a/test/Internal/Eval/Base.hs b/test/Internal/Eval/Base.hs
index 05779eb4ff..46f5853cba 100644
--- a/test/Internal/Eval/Base.hs
+++ b/test/Internal/Eval/Base.hs
@@ -35,9 +35,9 @@ internalCoreAssertion root' mainFile expectedFile step = do
                   (Info.member kNoDisplayInfo (getInfo value))
                   (hPutStrLn hout (ppPrint value))
                 hClose hout
-                actualOutput <- readFile (toFilePath outputFile)
+                actualOutput <- readFile outputFile
                 step "Compare expected and actual program output"
-                expected <- readFile (toFilePath expectedFile)
+                expected <- readFile expectedFile
                 assertEqDiffText ("Check: EVAL output = " <> toFilePath expectedFile) actualOutput expected
         )
     Nothing -> assertFailure ("No main function registered in: " <> toFilePath mainFile)
diff --git a/test/Reg/Parse/Base.hs b/test/Reg/Parse/Base.hs
index 4a719382fd..a270a1da48 100644
--- a/test/Reg/Parse/Base.hs
+++ b/test/Reg/Parse/Base.hs
@@ -28,5 +28,5 @@ regParseAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError InfoTable)
 parseFile f = do
-  s <- readFile (toFilePath f)
-  return $ runParser (toFilePath f) s
+  s <- readFile f
+  return (runParser f s)
diff --git a/test/Reg/Run/Base.hs b/test/Reg/Run/Base.hs
index dc7ba38110..1b94755154 100644
--- a/test/Reg/Run/Base.hs
+++ b/test/Reg/Run/Base.hs
@@ -35,9 +35,9 @@ regRunAssertionParam' interpretFun tab expectedFile step = do
             step "Interpret"
             interpretFun hout sym tab
             hClose hout
-            actualOutput <- readFile (toFilePath outputFile)
+            actualOutput <- readFile outputFile
             step "Compare expected and actual program output"
-            expected <- readFile (toFilePath expectedFile)
+            expected <- readFile expectedFile
             assertEqDiffText ("Check: RUN output = " <> toFilePath expectedFile) actualOutput expected
         )
     Nothing -> assertFailure "no 'main' function"
@@ -84,9 +84,8 @@ regRunErrorAssertion mainFile step = do
 
 parseFile :: Path Abs File -> IO (Either MegaparsecError InfoTable)
 parseFile f = do
-  let f' = toFilePath f
-  s <- readFile f'
-  return $ runParser f' s
+  s <- readFile f
+  return (runParser f s)
 
 doRun ::
   Handle ->
diff --git a/test/Runtime/Base.hs b/test/Runtime/Base.hs
index 6afd092eb4..f05d989d46 100644
--- a/test/Runtime/Base.hs
+++ b/test/Runtime/Base.hs
@@ -58,7 +58,7 @@ clangAssertion optLevel inputFile expectedFile stdinText step = do
   step "Lookup WASI_SYSROOT_PATH"
   sysrootPath :: Path Abs Dir <- getWasiSysrootPath
 
-  expected <- readFile (toFilePath expectedFile)
+  expected <- readFile expectedFile
 
   let executeWasm :: Path Abs File -> IO Text
       executeWasm outputFile = readProcess "wasmer" [toFilePath outputFile] stdinText
diff --git a/test/Tree/Asm/Base.hs b/test/Tree/Asm/Base.hs
index d05f2f6fd2..c85a782afe 100644
--- a/test/Tree/Asm/Base.hs
+++ b/test/Tree/Asm/Base.hs
@@ -13,8 +13,8 @@ treeAsmAssertion ::
   Assertion
 treeAsmAssertion mainFile expectedFile step = do
   step "Parse"
-  s <- readFile (toFilePath mainFile)
-  case runParser (toFilePath mainFile) s of
+  s <- readFile mainFile
+  case runParser mainFile s of
     Left err -> assertFailure (show (pretty err))
     Right tabIni -> do
       step "Translate"
diff --git a/test/Tree/Eval/Base.hs b/test/Tree/Eval/Base.hs
index 6f98965f7d..14f359be52 100644
--- a/test/Tree/Eval/Base.hs
+++ b/test/Tree/Eval/Base.hs
@@ -31,8 +31,8 @@ treeEvalAssertionParam ::
   Assertion
 treeEvalAssertionParam evalParam mainFile expectedFile trans testTrans step = do
   step "Parse"
-  s <- readFile (toFilePath mainFile)
-  case runParser (toFilePath mainFile) s of
+  s <- readFile mainFile
+  case runParser mainFile s of
     Left err -> assertFailure (show (pretty err))
     Right tab0 -> do
       step "Validate"
@@ -54,9 +54,9 @@ treeEvalAssertionParam evalParam mainFile expectedFile trans testTrans step = do
                         step "Evaluate"
                         evalParam hout sym tab
                         hClose hout
-                        actualOutput <- readFile (toFilePath outputFile)
+                        actualOutput <- readFile outputFile
                         step "Compare expected and actual program output"
-                        expected <- readFile (toFilePath expectedFile)
+                        expected <- readFile expectedFile
                         assertEqDiffText ("Check: RUN output = " <> toFilePath expectedFile) actualOutput expected
                     )
                 Nothing -> assertFailure "no 'main' function"
@@ -83,8 +83,8 @@ doEval hout tab funInfo = catchEvalErrorIO (hEvalIO stdin hout tab funInfo)
 treeEvalErrorAssertion :: Path Abs File -> (String -> IO ()) -> Assertion
 treeEvalErrorAssertion mainFile step = do
   step "Parse"
-  s <- readFile (toFilePath mainFile)
-  case runParser (toFilePath mainFile) s of
+  s <- readFile mainFile
+  case runParser mainFile s of
     Left err -> assertFailure (show (pretty err))
     Right tab ->
       case tab ^. infoMainFunction of
diff --git a/test/VampIR/Core/Base.hs b/test/VampIR/Core/Base.hs
index 303890c7d4..968289e312 100644
--- a/test/VampIR/Core/Base.hs
+++ b/test/VampIR/Core/Base.hs
@@ -11,7 +11,7 @@ data VampirBackend = VampirHalo2 | VampirPlonk
 vampirAssertion :: VampirBackend -> Path Abs File -> Path Abs File -> (String -> IO ()) -> Assertion
 vampirAssertion backend mainFile dataFile step = do
   step "Parse"
-  s <- readFile (toFilePath mainFile)
+  s <- readFile mainFile
   case runParserMain mainFile defaultModuleId mempty s of
     Left err -> assertFailure (show err)
     Right tab -> vampirAssertion' backend tab dataFile step