(svn r7274) -Codechange [utf8]: Add input/output unicode support. This actually only changes win32

since it uses UTF16 for file access. To keep os-specific code to a minimum, OpenTTD
 uses UTF8 internally everywhere, converting to OS-type when needed (save/load/screenshot/etc.)

stdafx.h

@@ -154,6 +154,19 @@
 # include <stddef.h>
 #endif /* defined(_MSC_VER) */
 
+/* NOTE: the string returned by these functions is only valid until the next
+ * call to the same function and is not thread- or reentrancy-safe */
+#if !defined(STRGEN)
+# if defined(WIN32) || defined(WIN64)
+#  define fopen(file, mode) _wfopen(OTTD2FS(file), L ## mode)
+   const char *FS2OTTD(const wchar_t *name);
+   const wchar_t *OTTD2FS(const char *name);
+# else
+#  define fopen(file, mode) fopen(OTTD2FS(file), mode)
+   const char *FS2OTTD(const char *name);
+   const char *OTTD2FS(const char *name);
+# endif /* WIN32 */
+#endif /* STRGEN */
 
 // Windows has always LITTLE_ENDIAN
 #if defined(WIN32) || defined(__OS2__) || defined(WIN64)