diff --git a/libretro/libretro-common/include/streams/file_stream_transforms.h b/libretro/libretro-common/include/streams/file_stream_transforms.h
new file mode 100644
index 0000000..602cc93
--- /dev/null
+++ b/libretro/libretro-common/include/streams/file_stream_transforms.h
@@ -0,0 +1,95 @@
+/* Copyright  (C) 2010-2017 The RetroArch team
+*
+* ---------------------------------------------------------------------------------------
+* The following license statement only applies to this file (file_stream.h).
+* ---------------------------------------------------------------------------------------
+*
+* Permission is hereby granted, free of charge,
+* to any person obtaining a copy of this software and associated documentation files (the "Software"),
+* to deal in the Software without restriction, including without limitation the rights to
+* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+*
+* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+#ifndef __LIBRETRO_SDK_FILE_STREAM_TRANSFORMS_H
+#define __LIBRETRO_SDK_FILE_STREAM_TRANSFORMS_H
+
+#include <streams/file_stream.h>
+#include <string.h>
+
+RETRO_BEGIN_DECLS
+
+#define FILE RFILE
+
+#define fopen rfopen
+#define fclose rfclose
+#define ftell rftell
+#define fseek rfseek
+#define fread rfread
+#define fgets rfgets
+#define fwrite rfwrite
+
+inline RFILE* rfopen(const char* path, char* mode)
+{
+	unsigned int retro_mode = RFILE_MODE_READ_TEXT;
+	if (strstr(mode, "r"))
+	{
+		if (strstr(mode, "b"))
+		{
+			retro_mode = RFILE_MODE_READ;
+		}
+	}
+	if (strstr(mode, "w"))
+	{
+		retro_mode = RFILE_MODE_WRITE;
+	}
+	if (strstr(mode, "+"))
+	{
+		retro_mode = RFILE_MODE_READ_WRITE;
+	}
+
+	return filestream_open(path, retro_mode, -1);
+}
+
+inline int rfclose(RFILE* stream)
+{
+	return filestream_close(stream);
+}
+
+inline long rftell(RFILE* stream)
+{
+	return filestream_tell(stream);
+}
+
+inline int rfseek(RFILE* stream, long offset, int origin)
+{
+	return filestream_seek(stream, offset, origin);
+}
+
+inline size_t rfread(void* buffer, size_t elementSize, size_t elementCount, RFILE* stream)
+{
+	return filestream_read(stream, buffer, elementSize*elementCount);
+}
+
+inline char* rfgets(char* buffer, int maxCount, FILE* stream)
+{
+	return filestream_gets(stream, buffer, maxCount);
+}
+
+inline size_t rfwrite(void const* buffer, size_t elementSize, size_t elementCount, RFILE* stream)
+{
+	return filestream_write(stream, buffer, elementSize*elementCount);
+}
+
+RETRO_END_DECLS
+
+#endif
diff --git a/libretro/osd.h b/libretro/osd.h
index 4c02b68..20eddc0 100644
--- a/libretro/osd.h
+++ b/libretro/osd.h
@@ -51,6 +51,7 @@ typedef unsigned char bool;
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
+#include <streams/file_stream_transforms.h>
 
 #define MAX_INPUTS 8
 #define MAX_KEYS 8
@@ -132,4 +133,14 @@ extern void osd_input_update(void);
 extern int load_archive(char *filename, unsigned char *buffer, int maxsize, char *extension);
 extern void ROMCheatUpdate(void);
 
+#ifndef cdStream
+#define cdStream            RFILE
+#define cdStreamOpen(fname) rfopen(fname, "rb")
+#define cdStreamClose       rfclose
+#define cdStreamRead        rfread
+#define cdStreamSeek        rfseek
+#define cdStreamTell        rftell
+#define cdStreamGets        rfgets
+#endif
+
 #endif /* _OSD_H */