diff --git a/core/fxcrt/cfx_fileaccess_posix.cpp b/core/fxcrt/cfx_fileaccess_posix.cpp
index f558282..f2264d3 100644
--- a/core/fxcrt/cfx_fileaccess_posix.cpp
+++ b/core/fxcrt/cfx_fileaccess_posix.cpp
@@ -65,10 +65,6 @@
   return m_nFD > -1;
 }
 
-bool CFX_FileAccess_Posix::Open(WideStringView fileName, uint32_t dwMode) {
-  return Open(FX_UTF8Encode(fileName).AsStringView(), dwMode);
-}
-
 void CFX_FileAccess_Posix::Close() {
   if (m_nFD < 0) {
     return;
diff --git a/core/fxcrt/cfx_fileaccess_posix.h b/core/fxcrt/cfx_fileaccess_posix.h
index b752691..1c31011 100644
--- a/core/fxcrt/cfx_fileaccess_posix.h
+++ b/core/fxcrt/cfx_fileaccess_posix.h
@@ -25,7 +25,6 @@
 
   // FileAccessIface:
   bool Open(ByteStringView fileName, uint32_t dwMode) override;
-  bool Open(WideStringView fileName, uint32_t dwMode) override;
   void Close() override;
   FX_FILESIZE GetSize() const override;
   FX_FILESIZE GetPosition() const override;
diff --git a/core/fxcrt/cfx_fileaccess_windows.cpp b/core/fxcrt/cfx_fileaccess_windows.cpp
index 3a0fd12..371aae3 100644
--- a/core/fxcrt/cfx_fileaccess_windows.cpp
+++ b/core/fxcrt/cfx_fileaccess_windows.cpp
@@ -44,25 +44,14 @@
   if (m_hFile)
     return false;
 
-  uint32_t dwAccess, dwShare, dwCreation;
+  uint32_t dwAccess;
+  uint32_t dwShare;
+  uint32_t dwCreation;
   GetFileMode(dwMode, dwAccess, dwShare, dwCreation);
-  m_hFile = ::CreateFileA(fileName.unterminated_c_str(), dwAccess, dwShare,
-                          nullptr, dwCreation, FILE_ATTRIBUTE_NORMAL, nullptr);
-  if (m_hFile == INVALID_HANDLE_VALUE)
-    m_hFile = nullptr;
 
-  return !!m_hFile;
-}
-
-bool CFX_FileAccess_Windows::Open(WideStringView fileName, uint32_t dwMode) {
-  if (m_hFile)
-    return false;
-
-  uint32_t dwAccess, dwShare, dwCreation;
-  GetFileMode(dwMode, dwAccess, dwShare, dwCreation);
-  m_hFile =
-      ::CreateFileW((LPCWSTR)fileName.unterminated_c_str(), dwAccess, dwShare,
-                    nullptr, dwCreation, FILE_ATTRIBUTE_NORMAL, nullptr);
+  WideString wname = FX_UTF8Decode(fileName);
+  m_hFile = ::CreateFileW(wname.c_str(), dwAccess, dwShare, nullptr, dwCreation,
+                          FILE_ATTRIBUTE_NORMAL, nullptr);
   if (m_hFile == INVALID_HANDLE_VALUE)
     m_hFile = nullptr;
 
diff --git a/core/fxcrt/cfx_fileaccess_windows.h b/core/fxcrt/cfx_fileaccess_windows.h
index 8a2d8a2..56c580d 100644
--- a/core/fxcrt/cfx_fileaccess_windows.h
+++ b/core/fxcrt/cfx_fileaccess_windows.h
@@ -25,7 +25,6 @@
 
   // FileAccessIface
   bool Open(ByteStringView fileName, uint32_t dwMode) override;
-  bool Open(WideStringView fileName, uint32_t dwMode) override;
   void Close() override;
   FX_FILESIZE GetSize() const override;
   FX_FILESIZE GetPosition() const override;
diff --git a/core/fxcrt/fileaccess_iface.h b/core/fxcrt/fileaccess_iface.h
index 8493ecb..ae34be5 100644
--- a/core/fxcrt/fileaccess_iface.h
+++ b/core/fxcrt/fileaccess_iface.h
@@ -16,8 +16,8 @@
   static std::unique_ptr<FileAccessIface> Create();
   virtual ~FileAccessIface() = default;
 
+  // `fileName` is UTF-8 on all platforms.
   virtual bool Open(ByteStringView fileName, uint32_t dwMode) = 0;
-  virtual bool Open(WideStringView fileName, uint32_t dwMode) = 0;
   virtual void Close() = 0;
   virtual FX_FILESIZE GetSize() const = 0;
   virtual FX_FILESIZE GetPosition() const = 0;
diff --git a/core/fxcrt/fx_stream.cpp b/core/fxcrt/fx_stream.cpp
index 9a65181..3039744 100644
--- a/core/fxcrt/fx_stream.cpp
+++ b/core/fxcrt/fx_stream.cpp
@@ -77,16 +77,6 @@
 }
 
 // static
-RetainPtr<IFX_SeekableStream> IFX_SeekableStream::CreateFromFilename(
-    const wchar_t* filename,
-    uint32_t dwModes) {
-  std::unique_ptr<FileAccessIface> pFA = FileAccessIface::Create();
-  if (!pFA->Open(filename, dwModes))
-    return nullptr;
-  return pdfium::MakeRetain<CFX_CRTFileStream>(std::move(pFA));
-}
-
-// static
 RetainPtr<IFX_SeekableReadStream> IFX_SeekableReadStream::CreateFromFilename(
     const char* filename) {
   return IFX_SeekableStream::CreateFromFilename(filename, FX_FILEMODE_ReadOnly);
diff --git a/core/fxcrt/fx_stream.h b/core/fxcrt/fx_stream.h
index 9239ab4..7658e0b 100644
--- a/core/fxcrt/fx_stream.h
+++ b/core/fxcrt/fx_stream.h
@@ -77,11 +77,6 @@
   static RetainPtr<IFX_SeekableStream> CreateFromFilename(const char* filename,
                                                           uint32_t dwModes);
 
-  // dwModes is a mask of FX_FILEMODE_* from above.
-  static RetainPtr<IFX_SeekableStream> CreateFromFilename(
-      const wchar_t* filename,
-      uint32_t dwModes);
-
   // IFX_SeekableWriteStream:
   bool WriteBlock(const void* buffer, size_t size) override;
 };
diff --git a/public/fpdfview.h b/public/fpdfview.h
index a06f8f8..d7f6f07 100644
--- a/public/fpdfview.h
+++ b/public/fpdfview.h
@@ -335,6 +335,8 @@
 //          If this function fails, you can use FPDF_GetLastError() to retrieve
 //          the reason why it failed.
 //
+//          The encoding for |file_path| is UTF-8.
+//
 //          The encoding for |password| can be either UTF-8 or Latin-1. PDFs,
 //          depending on the security handler revision, will only accept one or
 //          the other encoding. If |password|'s encoding and the PDF's expected