diff --git a/clang-tools-extra/clangd/FS.cpp b/clang-tools-extra/clangd/FS.cpp
index 5729b9341d9d4..bd3c6440c24b0 100644
--- a/clang-tools-extra/clangd/FS.cpp
+++ b/clang-tools-extra/clangd/FS.cpp
@@ -64,8 +64,8 @@ PreambleFileStatusCache::getProducingFS(
         : ProxyFileSystem(std::move(FS)), StatCache(StatCache) {}
 
     llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-    openFileForRead(const llvm::Twine &Path) override {
-      auto File = getUnderlyingFS().openFileForRead(Path);
+    openFileForRead(const llvm::Twine &Path, bool IsText = true) override {
+      auto File = getUnderlyingFS().openFileForRead(Path, IsText);
       if (!File || !*File)
         return File;
       // Eagerly stat opened file, as the followup `status` call on the file
diff --git a/clang-tools-extra/clangd/Preamble.cpp b/clang-tools-extra/clangd/Preamble.cpp
index c14c4d1ba103f..55cfe1c97fc6f 100644
--- a/clang-tools-extra/clangd/Preamble.cpp
+++ b/clang-tools-extra/clangd/Preamble.cpp
@@ -479,9 +479,9 @@ class TimerFS : public llvm::vfs::ProxyFileSystem {
       : ProxyFileSystem(std::move(FS)) {}
 
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const llvm::Twine &Path) override {
+  openFileForRead(const llvm::Twine &Path, bool IsText = true) override {
     WallTimerRegion T(Timer);
-    auto FileOr = getUnderlyingFS().openFileForRead(Path);
+    auto FileOr = getUnderlyingFS().openFileForRead(Path, IsText);
     if (!FileOr)
       return FileOr;
     return std::make_unique<TimerFile>(Timer, std::move(FileOr.get()));
diff --git a/clang-tools-extra/clangd/support/ThreadsafeFS.cpp b/clang-tools-extra/clangd/support/ThreadsafeFS.cpp
index 7398e4258527b..bc0b984e577cb 100644
--- a/clang-tools-extra/clangd/support/ThreadsafeFS.cpp
+++ b/clang-tools-extra/clangd/support/ThreadsafeFS.cpp
@@ -29,7 +29,7 @@ class VolatileFileSystem : public llvm::vfs::ProxyFileSystem {
       : ProxyFileSystem(std::move(FS)) {}
 
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const llvm::Twine &InPath) override {
+  openFileForRead(const llvm::Twine &InPath, bool IsText = true) override {
     llvm::SmallString<128> Path;
     InPath.toVector(Path);
 
diff --git a/clang-tools-extra/clangd/unittests/ClangdTests.cpp b/clang-tools-extra/clangd/unittests/ClangdTests.cpp
index 643b8e9f12d75..e86385c2072b3 100644
--- a/clang-tools-extra/clangd/unittests/ClangdTests.cpp
+++ b/clang-tools-extra/clangd/unittests/ClangdTests.cpp
@@ -1010,7 +1010,7 @@ TEST(ClangdTests, PreambleVFSStatCache) {
             : ProxyFileSystem(std::move(FS)), CountStats(CountStats) {}
 
         llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-        openFileForRead(const Twine &Path) override {
+        openFileForRead(const Twine &Path, bool IsText = true) override {
           ++CountStats[llvm::sys::path::filename(Path.str())];
           return ProxyFileSystem::openFileForRead(Path);
         }
diff --git a/clang/include/clang/Basic/FileManager.h b/clang/include/clang/Basic/FileManager.h
index ce4e8c1fbe16e..d987fb05a94a3 100644
--- a/clang/include/clang/Basic/FileManager.h
+++ b/clang/include/clang/Basic/FileManager.h
@@ -292,21 +292,21 @@ class FileManager : public RefCountedBase<FileManager> {
   /// MemoryBuffer if successful, otherwise returning null.
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
   getBufferForFile(FileEntryRef Entry, bool isVolatile = false,
-                   bool RequiresNullTerminator = true,
+                   bool RequiresNullTerminator = true, bool IsText = true,
                    std::optional<int64_t> MaybeLimit = std::nullopt);
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
   getBufferForFile(StringRef Filename, bool isVolatile = false,
-                   bool RequiresNullTerminator = true,
+                   bool RequiresNullTerminator = true, bool IsText = true,
                    std::optional<int64_t> MaybeLimit = std::nullopt) const {
     return getBufferForFileImpl(Filename,
                                 /*FileSize=*/MaybeLimit.value_or(-1),
-                                isVolatile, RequiresNullTerminator);
+                                isVolatile, RequiresNullTerminator, IsText);
   }
 
 private:
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
   getBufferForFileImpl(StringRef Filename, int64_t FileSize, bool isVolatile,
-                       bool RequiresNullTerminator) const;
+                       bool RequiresNullTerminator, bool IsText) const;
 
   DirectoryEntry *&getRealDirEntry(const llvm::vfs::Status &Status);
 
diff --git a/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h b/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
index d12814e7c9253..635fdd0e00c43 100644
--- a/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
+++ b/clang/include/clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h
@@ -346,7 +346,7 @@ class DependencyScanningWorkerFilesystem
 
   llvm::ErrorOr<llvm::vfs::Status> status(const Twine &Path) override;
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const Twine &Path) override;
+  openFileForRead(const Twine &Path, bool IsText = true) override;
 
   std::error_code getRealPath(const Twine &Path,
                               SmallVectorImpl<char> &Output) override;
diff --git a/clang/lib/Basic/FileManager.cpp b/clang/lib/Basic/FileManager.cpp
index 6097b85a03064..27075cefafdc2 100644
--- a/clang/lib/Basic/FileManager.cpp
+++ b/clang/lib/Basic/FileManager.cpp
@@ -530,7 +530,7 @@ void FileManager::fillRealPathName(FileEntry *UFE, llvm::StringRef FileName) {
 
 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
 FileManager::getBufferForFile(FileEntryRef FE, bool isVolatile,
-                              bool RequiresNullTerminator,
+                              bool RequiresNullTerminator, bool IsText,
                               std::optional<int64_t> MaybeLimit) {
   const FileEntry *Entry = &FE.getFileEntry();
   // If the content is living on the file entry, return a reference to it.
@@ -558,21 +558,21 @@ FileManager::getBufferForFile(FileEntryRef FE, bool isVolatile,
 
   // Otherwise, open the file.
   return getBufferForFileImpl(Filename, FileSize, isVolatile,
-                              RequiresNullTerminator);
+                              RequiresNullTerminator, IsText);
 }
 
 llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
 FileManager::getBufferForFileImpl(StringRef Filename, int64_t FileSize,
-                                  bool isVolatile,
-                                  bool RequiresNullTerminator) const {
+                                  bool isVolatile, bool RequiresNullTerminator,
+                                  bool IsText) const {
   if (FileSystemOpts.WorkingDir.empty())
     return FS->getBufferForFile(Filename, FileSize, RequiresNullTerminator,
-                                isVolatile);
+                                isVolatile, IsText);
 
   SmallString<128> FilePath(Filename);
   FixupRelativePath(FilePath);
   return FS->getBufferForFile(FilePath, FileSize, RequiresNullTerminator,
-                              isVolatile);
+                              isVolatile, IsText);
 }
 
 /// getStatValue - Get the 'stat' information for the specified path,
diff --git a/clang/lib/Lex/HeaderMap.cpp b/clang/lib/Lex/HeaderMap.cpp
index 00bf880726ee3..35c68b304a452 100644
--- a/clang/lib/Lex/HeaderMap.cpp
+++ b/clang/lib/Lex/HeaderMap.cpp
@@ -54,7 +54,9 @@ std::unique_ptr<HeaderMap> HeaderMap::Create(FileEntryRef FE, FileManager &FM) {
   unsigned FileSize = FE.getSize();
   if (FileSize <= sizeof(HMapHeader)) return nullptr;
 
-  auto FileBuffer = FM.getBufferForFile(FE);
+  auto FileBuffer =
+      FM.getBufferForFile(FE, /*IsVolatile=*/false,
+                          /*RequiresNullTerminator=*/true, /*IsText=*/false);
   if (!FileBuffer || !*FileBuffer)
     return nullptr;
   bool NeedsByteSwap;
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 8623c030b6d59..c575869a9061d 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -5328,7 +5328,8 @@ std::string ASTReader::getOriginalSourceFile(
     const PCHContainerReader &PCHContainerRdr, DiagnosticsEngine &Diags) {
   // Open the AST file.
   auto Buffer = FileMgr.getBufferForFile(ASTFileName, /*IsVolatile=*/false,
-                                         /*RequiresNullTerminator=*/false);
+                                         /*RequiresNullTerminator=*/false,
+                                         /*IsText=*/false);
   if (!Buffer) {
     Diags.Report(diag::err_fe_unable_to_read_pch_file)
         << ASTFileName << Buffer.getError().message();
diff --git a/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp b/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
index 4d738e4bea41a..7d6239a0732fe 100644
--- a/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
+++ b/clang/lib/Tooling/DependencyScanning/DependencyScanningFilesystem.cpp
@@ -353,12 +353,13 @@ DepScanFile::create(EntryRef Entry) {
 }
 
 llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-DependencyScanningWorkerFilesystem::openFileForRead(const Twine &Path) {
+DependencyScanningWorkerFilesystem::openFileForRead(const Twine &Path,
+                                                    bool IsText) {
   SmallString<256> OwnedFilename;
   StringRef Filename = Path.toStringRef(OwnedFilename);
 
   if (shouldBypass(Filename))
-    return getUnderlyingFS().openFileForRead(Path);
+    return getUnderlyingFS().openFileForRead(Path, IsText);
 
   llvm::ErrorOr<EntryRef> Result = getOrCreateFileSystemEntry(Filename);
   if (!Result)
diff --git a/clang/unittests/Driver/DistroTest.cpp b/clang/unittests/Driver/DistroTest.cpp
index 43efc0dd8f51e..4c13b8bbb9408 100644
--- a/clang/unittests/Driver/DistroTest.cpp
+++ b/clang/unittests/Driver/DistroTest.cpp
@@ -352,9 +352,9 @@ TEST(DistroTest, DetectWindowsAndCrossCompile) {
     }
 
     llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-    openFileForRead(const llvm::Twine &Path) override {
+    openFileForRead(const llvm::Twine &Path, bool IsText = true) override {
       ++Count;
-      return llvm::vfs::ProxyFileSystem::openFileForRead(Path);
+      return llvm::vfs::ProxyFileSystem::openFileForRead(Path, IsText);
     }
 
     unsigned Count{};
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
index 8542a168f93c2..672742cea5d6b 100644
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -683,7 +683,7 @@ struct FileSystemWithError : public llvm::vfs::FileSystem {
     return std::make_error_code(std::errc::no_such_file_or_directory);
   }
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const Twine &Path) override {
+  openFileForRead(const Twine &Path, bool IsText = true) override {
     return std::make_error_code(std::errc::permission_denied);
   }
   llvm::vfs::directory_iterator dir_begin(const Twine &Dir,
diff --git a/clang/unittests/Frontend/PCHPreambleTest.cpp b/clang/unittests/Frontend/PCHPreambleTest.cpp
index 2ce24c91ac0f1..137dcf2377be4 100644
--- a/clang/unittests/Frontend/PCHPreambleTest.cpp
+++ b/clang/unittests/Frontend/PCHPreambleTest.cpp
@@ -36,10 +36,10 @@ class ReadCountingInMemoryFileSystem : public vfs::InMemoryFileSystem
   std::map<std::string, unsigned> ReadCounts;
 
 public:
-  ErrorOr<std::unique_ptr<vfs::File>> openFileForRead(const Twine &Path) override
-  {
+  ErrorOr<std::unique_ptr<vfs::File>>
+  openFileForRead(const Twine &Path, bool IsText = true) override {
     ++ReadCounts[Canonicalize(Path)];
-    return InMemoryFileSystem::openFileForRead(Path);
+    return InMemoryFileSystem::openFileForRead(Path, IsText);
   }
 
   unsigned GetReadCount(const Twine &Path) const
diff --git a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
index ec0e143be4a20..1012016ed03c7 100644
--- a/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
+++ b/clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp
@@ -277,9 +277,9 @@ TEST(DependencyScanner, ScanDepsWithModuleLookup) {
     }
 
     llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-    openFileForRead(const Twine &Path) override {
+    openFileForRead(const Twine &Path, bool IsText = true) override {
       ReadFiles.push_back(Path.str());
-      return ProxyFileSystem::openFileForRead(Path);
+      return ProxyFileSystem::openFileForRead(Path, IsText);
     }
   };
 
diff --git a/lldb/unittests/Host/FileSystemTest.cpp b/lldb/unittests/Host/FileSystemTest.cpp
index 58887f6b2467e..3c76f1d1bed21 100644
--- a/lldb/unittests/Host/FileSystemTest.cpp
+++ b/lldb/unittests/Host/FileSystemTest.cpp
@@ -59,7 +59,7 @@ class DummyFileSystem : public vfs::FileSystem {
     return I->second;
   }
   ErrorOr<std::unique_ptr<vfs::File>>
-  openFileForRead(const Twine &Path) override {
+  openFileForRead(const Twine &Path, bool Text = true) override {
     auto S = status(Path);
     if (S)
       return std::unique_ptr<vfs::File>(new DummyFile{*S});
diff --git a/lldb/unittests/Utility/MockSymlinkFileSystem.h b/lldb/unittests/Utility/MockSymlinkFileSystem.h
index 7fa1f93bfa38a..32a86cd669fb1 100644
--- a/lldb/unittests/Utility/MockSymlinkFileSystem.h
+++ b/lldb/unittests/Utility/MockSymlinkFileSystem.h
@@ -43,7 +43,7 @@ class MockSymlinkFileSystem : public llvm::vfs::FileSystem {
     return llvm::errc::operation_not_permitted;
   }
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const llvm::Twine &Path) override {
+  openFileForRead(const llvm::Twine &Path, bool IsText = true) override {
     return llvm::errc::operation_not_permitted;
   }
   llvm::vfs::directory_iterator dir_begin(const llvm::Twine &Dir,
diff --git a/llvm/include/llvm/Support/VirtualFileSystem.h b/llvm/include/llvm/Support/VirtualFileSystem.h
index 2531c075f262d..2256fde2faa66 100644
--- a/llvm/include/llvm/Support/VirtualFileSystem.h
+++ b/llvm/include/llvm/Support/VirtualFileSystem.h
@@ -273,13 +273,14 @@ class FileSystem : public llvm::ThreadSafeRefCountedBase<FileSystem>,
 
   /// Get a \p File object for the file at \p Path, if one exists.
   virtual llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) = 0;
+  openFileForRead(const Twine &Path, bool IsText = true) = 0;
 
   /// This is a convenience method that opens a file, gets its content and then
   /// closes the file.
   llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>>
   getBufferForFile(const Twine &Name, int64_t FileSize = -1,
-                   bool RequiresNullTerminator = true, bool IsVolatile = false);
+                   bool RequiresNullTerminator = true, bool IsVolatile = false,
+                   bool IsText = true);
 
   /// Get a directory_iterator for \p Dir.
   /// \note The 'end' iterator is directory_iterator().
@@ -392,7 +393,7 @@ class OverlayFileSystem : public RTTIExtends<OverlayFileSystem, FileSystem> {
   llvm::ErrorOr<Status> status(const Twine &Path) override;
   bool exists(const Twine &Path) override;
   llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) override;
+  openFileForRead(const Twine &Path, bool IsText = true) override;
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
   llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
   std::error_code setCurrentWorkingDirectory(const Twine &Path) override;
@@ -446,8 +447,8 @@ class ProxyFileSystem : public RTTIExtends<ProxyFileSystem, FileSystem> {
   }
   bool exists(const Twine &Path) override { return FS->exists(Path); }
   llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) override {
-    return FS->openFileForRead(Path);
+  openFileForRead(const Twine &Path, bool IsText = true) override {
+    return FS->openFileForRead(Path, IsText);
   }
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override {
     return FS->dir_begin(Dir, EC);
@@ -615,7 +616,7 @@ class InMemoryFileSystem : public RTTIExtends<InMemoryFileSystem, FileSystem> {
 
   llvm::ErrorOr<Status> status(const Twine &Path) override;
   llvm::ErrorOr<std::unique_ptr<File>>
-  openFileForRead(const Twine &Path) override;
+  openFileForRead(const Twine &Path, bool IsText = true) override;
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
 
   llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override {
@@ -1051,7 +1052,8 @@ class RedirectingFileSystem
 
   ErrorOr<Status> status(const Twine &Path) override;
   bool exists(const Twine &Path) override;
-  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override;
+  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path,
+                                                 bool IsText = true) override;
 
   std::error_code getRealPath(const Twine &Path,
                               SmallVectorImpl<char> &Output) override;
@@ -1155,9 +1157,10 @@ class TracingFileSystem
     return ProxyFileSystem::status(Path);
   }
 
-  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override {
+  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path,
+                                                 bool IsText = true) override {
     ++NumOpenFileForReadCalls;
-    return ProxyFileSystem::openFileForRead(Path);
+    return ProxyFileSystem::openFileForRead(Path, IsText);
   }
 
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override {
diff --git a/llvm/lib/Support/FileCollector.cpp b/llvm/lib/Support/FileCollector.cpp
index 29436f85c2f23..966c5ac90e941 100644
--- a/llvm/lib/Support/FileCollector.cpp
+++ b/llvm/lib/Support/FileCollector.cpp
@@ -268,8 +268,8 @@ class FileCollectorFileSystem : public vfs::FileSystem {
   }
 
   llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-  openFileForRead(const Twine &Path) override {
-    auto Result = FS->openFileForRead(Path);
+  openFileForRead(const Twine &Path, bool IsText = true) override {
+    auto Result = FS->openFileForRead(Path, IsText);
     if (Result && *Result)
       Collector->addFile(Path);
     return Result;
diff --git a/llvm/lib/Support/VirtualFileSystem.cpp b/llvm/lib/Support/VirtualFileSystem.cpp
index 928c0b5a24ed6..4c671acd28521 100644
--- a/llvm/lib/Support/VirtualFileSystem.cpp
+++ b/llvm/lib/Support/VirtualFileSystem.cpp
@@ -117,8 +117,9 @@ FileSystem::~FileSystem() = default;
 
 ErrorOr<std::unique_ptr<MemoryBuffer>>
 FileSystem::getBufferForFile(const llvm::Twine &Name, int64_t FileSize,
-                             bool RequiresNullTerminator, bool IsVolatile) {
-  auto F = openFileForRead(Name);
+                             bool RequiresNullTerminator, bool IsVolatile,
+                             bool IsText) {
+  auto F = openFileForRead(Name, IsText);
   if (!F)
     return F.getError();
 
@@ -278,7 +279,8 @@ class RealFileSystem : public FileSystem {
   }
 
   ErrorOr<Status> status(const Twine &Path) override;
-  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path) override;
+  ErrorOr<std::unique_ptr<File>> openFileForRead(const Twine &Path,
+                                                 bool IsText = true) override;
   directory_iterator dir_begin(const Twine &Dir, std::error_code &EC) override;
 
   llvm::ErrorOr<std::string> getCurrentWorkingDirectory() const override;
@@ -323,10 +325,11 @@ ErrorOr<Status> RealFileSystem::status(const Twine &Path) {
 }
 
 ErrorOr<std::unique_ptr<File>>
-RealFileSystem::openFileForRead(const Twine &Name) {
+RealFileSystem::openFileForRead(const Twine &Name, bool IsText) {
   SmallString<256> RealName, Storage;
   Expected<file_t> FDOrErr = sys::fs::openNativeFileForRead(
-      adjustPath(Name, Storage), sys::fs::OF_None, &RealName);
+      adjustPath(Name, Storage), IsText ? sys::fs::OF_Text : sys::fs::OF_None,
+      &RealName);
   if (!FDOrErr)
     return errorToErrorCode(FDOrErr.takeError());
   return std::unique_ptr<File>(
@@ -458,10 +461,10 @@ bool OverlayFileSystem::exists(const Twine &Path) {
 }
 
 ErrorOr<std::unique_ptr<File>>
-OverlayFileSystem::openFileForRead(const llvm::Twine &Path) {
+OverlayFileSystem::openFileForRead(const llvm::Twine &Path, bool IsText) {
   // FIXME: handle symlinks that cross file systems
   for (iterator I = overlays_begin(), E = overlays_end(); I != E; ++I) {
-    auto Result = (*I)->openFileForRead(Path);
+    auto Result = (*I)->openFileForRead(Path, IsText);
     if (Result || Result.getError() != llvm::errc::no_such_file_or_directory)
       return Result;
   }
@@ -1073,7 +1076,7 @@ llvm::ErrorOr<Status> InMemoryFileSystem::status(const Twine &Path) {
 }
 
 llvm::ErrorOr<std::unique_ptr<File>>
-InMemoryFileSystem::openFileForRead(const Twine &Path) {
+InMemoryFileSystem::openFileForRead(const Twine &Path, bool IsText) {
   auto Node = lookupNode(Path,/*FollowFinalSymlink=*/true);
   if (!Node)
     return Node.getError();
@@ -2537,7 +2540,7 @@ File::getWithPath(ErrorOr<std::unique_ptr<File>> Result, const Twine &P) {
 }
 
 ErrorOr<std::unique_ptr<File>>
-RedirectingFileSystem::openFileForRead(const Twine &OriginalPath) {
+RedirectingFileSystem::openFileForRead(const Twine &OriginalPath, bool IsText) {
   SmallString<256> Path;
   OriginalPath.toVector(Path);
 
@@ -2547,7 +2550,8 @@ RedirectingFileSystem::openFileForRead(const Twine &OriginalPath) {
   if (Redirection == RedirectKind::Fallback) {
     // Attempt to find the original file first, only falling back to the
     // mapped file if that fails.
-    auto F = File::getWithPath(ExternalFS->openFileForRead(Path), OriginalPath);
+    auto F = File::getWithPath(ExternalFS->openFileForRead(Path, IsText),
+                               OriginalPath);
     if (F)
       return F;
   }
@@ -2558,7 +2562,8 @@ RedirectingFileSystem::openFileForRead(const Twine &OriginalPath) {
     // that was the specified redirection type.
     if (Redirection == RedirectKind::Fallthrough &&
         isFileNotFound(Result.getError()))
-      return File::getWithPath(ExternalFS->openFileForRead(Path), OriginalPath);
+      return File::getWithPath(ExternalFS->openFileForRead(Path, IsText),
+                               OriginalPath);
     return Result.getError();
   }
 
@@ -2572,15 +2577,16 @@ RedirectingFileSystem::openFileForRead(const Twine &OriginalPath) {
 
   auto *RE = cast<RedirectingFileSystem::RemapEntry>(Result->E);
 
-  auto ExternalFile =
-      File::getWithPath(ExternalFS->openFileForRead(RemappedPath), ExtRedirect);
+  auto ExternalFile = File::getWithPath(
+      ExternalFS->openFileForRead(RemappedPath, IsText), ExtRedirect);
   if (!ExternalFile) {
     if (Redirection == RedirectKind::Fallthrough &&
         isFileNotFound(ExternalFile.getError(), Result->E)) {
       // Mapped the file but it wasn't found in the underlying filesystem,
       // fallthrough to using the original path if that was the specified
       // redirection type.
-      return File::getWithPath(ExternalFS->openFileForRead(Path), OriginalPath);
+      return File::getWithPath(ExternalFS->openFileForRead(Path, IsText),
+                               OriginalPath);
     }
     return ExternalFile;
   }
diff --git a/llvm/unittests/Support/VirtualFileSystemTest.cpp b/llvm/unittests/Support/VirtualFileSystemTest.cpp
index eb590e474c2ec..219aaefd43f65 100644
--- a/llvm/unittests/Support/VirtualFileSystemTest.cpp
+++ b/llvm/unittests/Support/VirtualFileSystemTest.cpp
@@ -67,7 +67,7 @@ class DummyFileSystem : public vfs::FileSystem {
     return I->second;
   }
   ErrorOr<std::unique_ptr<vfs::File>>
-  openFileForRead(const Twine &Path) override {
+  openFileForRead(const Twine &Path, bool IsText = true) override {
     auto S = status(Path);
     if (S)
       return std::unique_ptr<vfs::File>(new DummyFile{*S});
@@ -3389,9 +3389,9 @@ TEST(RedirectingFileSystemTest, ExternalPaths) {
     }
 
     llvm::ErrorOr<std::unique_ptr<llvm::vfs::File>>
-    openFileForRead(const Twine &Path) override {
+    openFileForRead(const Twine &Path, bool IsText = true) override {
       SeenPaths.push_back(Path.str());
-      return ProxyFileSystem::openFileForRead(Path);
+      return ProxyFileSystem::openFileForRead(Path, IsText);
     }
 
     std::error_code isLocal(const Twine &Path, bool &Result) override {