Use FileStream's ctor instead of File.Open when all access is synchronous

src/System.Diagnostics.FileVersionInfo/src/System/Diagnostics/FileVersionInfo.Unix.cs

@@ -43,7 +43,7 @@ private bool TryLoadManagedAssemblyMetadata()
             try
             {
                 // Try to load the file using the managed metadata reader
-                using (FileStream assemblyStream = File.OpenRead(_fileName))
+                using (FileStream assemblyStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 0x1000, useAsync: false))
                 using (PEReader peReader = new PEReader(assemblyStream))
                 {
                     if (peReader.HasMetadata)

src/System.IO.Compression.ZipFile/src/System/IO/Compression/ZipFile.cs

@@ -158,7 +158,7 @@ public static ZipArchive Open(String archiveFileName, ZipArchiveMode mode)
         [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope")]  // See comment in the body.
         public static ZipArchive Open(String archiveFileName, ZipArchiveMode mode, Encoding entryNameEncoding)
         {
-            // Relies on File.Open for checking of archiveFileName
+            // Relies on FileStream's ctor for checking of archiveFileName
 
             FileMode fileMode;
             FileAccess access;
@@ -193,7 +193,7 @@ public static ZipArchive Open(String archiveFileName, ZipArchiveMode mode, Encod
             // If the ctor completes without throwing, we know fs has been successfully stores in the archive;
             // If the ctor throws, we need to close it here.
 
-            FileStream fs = File.Open(archiveFileName, fileMode, access, fileShare);
+            FileStream fs = new FileStream(archiveFileName, fileMode, access, fileShare, bufferSize: 0x1000, useAsync: false);
 
             try
             {

src/System.IO.Compression.ZipFile/src/System/IO/Compression/ZipFileExtensions.cs

@@ -178,11 +178,11 @@ internal static ZipArchiveEntry DoCreateEntryFromFile(ZipArchive destination,
             // Checking of compressionLevel is passed down to DeflateStream and the IDeflater implementation
             // as it is a pugable component that completely encapsulates the meaning of compressionLevel.
 
-            // Argument checking gets passed down to File.Open and CreateEntry
+            // Argument checking gets passed down to FileStream's ctor and CreateEntry
             Contract.Ensures(Contract.Result<ZipArchiveEntry>() != null);
             Contract.EndContractBlock();
 
-            using (Stream fs = File.Open(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read))
+            using (Stream fs = new FileStream(sourceFileName, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 0x1000, useAsync: false))
             {
                 ZipArchiveEntry entry = compressionLevel.HasValue
                                                 ? destination.CreateEntry(entryName, compressionLevel.Value)
@@ -276,13 +276,13 @@ public static void ExtractToFile(this ZipArchiveEntry source, String destination
             if (destinationFileName == null)
                 throw new ArgumentNullException("destinationFileName");
 
-            // Rely on File.Open for further checking destinationFileName parameter
+            // Rely on FileStream's ctor for further checking destinationFileName parameter
 
             Contract.EndContractBlock();
 
             FileMode fMode = overwrite ? FileMode.Create : FileMode.CreateNew;
 
-            using (Stream fs = File.Open(destinationFileName, fMode, FileAccess.Write, FileShare.None))
+            using (Stream fs = new FileStream(destinationFileName, fMode, FileAccess.Write, FileShare.None, bufferSize: 0x1000, useAsync: false))
             {
                 using (Stream es = source.Open())
                     es.CopyTo(fs);

src/System.Net.NetworkInformation/src/System/Net/NetworkInformation/StringParsingHelpers.Statistics.cs

@@ -397,7 +397,7 @@ internal static UdpGlobalStatisticsTable ParseUdpv6GlobalStatisticsFromSnmp6File
 
         internal static IPInterfaceStatisticsTable ParseInterfaceStatisticsTableFromFile(string filePath, string name)
         {
-            using (StreamReader sr = File.OpenText(filePath))
+            using (StreamReader sr = new StreamReader(new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, bufferSize: 0x1000, useAsync: false)))
             {
                 sr.ReadLine();
                 sr.ReadLine();