diff --git a/config-test/src/main/java/com/powsybl/config/test/TestPlatformConfigProvider.java b/config-test/src/main/java/com/powsybl/config/test/TestPlatformConfigProvider.java
index 91e9f860a0c..08abd246cf1 100644
--- a/config-test/src/main/java/com/powsybl/config/test/TestPlatformConfigProvider.java
+++ b/config-test/src/main/java/com/powsybl/config/test/TestPlatformConfigProvider.java
@@ -74,6 +74,7 @@ public PlatformConfig getPlatformConfig() {
                 // The resources have relative paths (no leading slash) with full package path.
                 Path dest = cfgDir.resolve(resource);
                 LOGGER.info("Copying classpath resource: {} -> {}", resource, dest);
+                Files.createDirectories(dest.getParent());
                 Files.copy(TestPlatformConfigProvider.class.getResourceAsStream(resource), dest);
             }
         } catch (IOException e) {
diff --git a/config-test/src/test/java/com/powsybl/config/test/TestPlatformConfigProviderTest.java b/config-test/src/test/java/com/powsybl/config/test/TestPlatformConfigProviderTest.java
index 3b28bbed509..3545bd0ada0 100644
--- a/config-test/src/test/java/com/powsybl/config/test/TestPlatformConfigProviderTest.java
+++ b/config-test/src/test/java/com/powsybl/config/test/TestPlatformConfigProviderTest.java
@@ -30,11 +30,16 @@ void test() throws IOException {
         assertEquals("/work/" + TestPlatformConfigProvider.CONFIG_DIR,
                 platformConfig.getConfigDir().map(Path::toString).orElse(null));
 
-        Path testPath = platformConfig.getConfigDir().map(p -> p.resolve("other.txt")).orElse(null);
+        checkFileContent(platformConfig, "other.txt", "conf");
+        checkFileContent(platformConfig, "subfolder/subfolder_file.txt", "subfile content");
+        assertEquals("baz", platformConfig.getOptionalModuleConfig("foo").flatMap(c -> c.getOptionalStringProperty("bar")).orElse(""));
+    }
+
+    private void checkFileContent(PlatformConfig platformConfig, String file, String content) throws IOException {
+        Path testPath = platformConfig.getConfigDir().map(p -> p.resolve(file)).orElse(null);
         assertNotNull(testPath);
         String testContent = Files.readAllLines(testPath, StandardCharsets.UTF_8).get(0);
-        assertEquals("conf", testContent);
-        assertEquals("baz", platformConfig.getOptionalModuleConfig("foo").flatMap(c -> c.getOptionalStringProperty("bar")).orElse(""));
+        assertEquals(content, testContent);
     }
 
     @Test
diff --git a/config-test/src/test/resources/com/powsybl/config/test/filelist.txt b/config-test/src/test/resources/com/powsybl/config/test/filelist.txt
index 8c98f97de36..4e6ac675e5d 100644
--- a/config-test/src/test/resources/com/powsybl/config/test/filelist.txt
+++ b/config-test/src/test/resources/com/powsybl/config/test/filelist.txt
@@ -1,3 +1,4 @@
 config.yml
 other.txt
 base-voltages.yml
+subfolder/subfolder_file.txt
diff --git a/config-test/src/test/resources/com/powsybl/config/test/subfolder/subfolder_file.txt b/config-test/src/test/resources/com/powsybl/config/test/subfolder/subfolder_file.txt
new file mode 100644
index 00000000000..7b98f0ca009
--- /dev/null
+++ b/config-test/src/test/resources/com/powsybl/config/test/subfolder/subfolder_file.txt
@@ -0,0 +1 @@
+subfile content
\ No newline at end of file