diff --git a/Source/Windows/Common/CRT/IO.cpp b/Source/Windows/Common/CRT/IO.cpp
index db02645e34..d3ec9eb99d 100644
--- a/Source/Windows/Common/CRT/IO.cpp
+++ b/Source/Windows/Common/CRT/IO.cpp
@@ -278,31 +278,23 @@ int fclose(FILE* File) {
   return 0;
 }
 
-int fseeko64(FILE* File, _off64_t Offset, int Origin) {
+DLLEXPORT_FUNC(int, _fseeki64, (FILE* File, _off64_t Offset, int Origin)) {
   SetFilePointerEx(File->Handle, LARGE_INTEGER {.QuadPart = Offset}, nullptr, OriginToMoveMethod(Origin));
   return 0;
 }
 
-int fseeko(FILE* File, _off_t Offset, int Origin) {
-  return fseeko64(File, Offset, Origin);
-}
-
 int fseek(FILE* File, long Offset, int Origin) {
-  return fseeko64(File, Offset, Origin);
+  return _fseeki64(File, Offset, Origin);
 }
 
-_off64_t ftello64(FILE* File) {
+DLLEXPORT_FUNC(_off64_t, _ftelli64, (FILE* File)) {
   LARGE_INTEGER Res;
   SetFilePointerEx(File->Handle, LARGE_INTEGER {}, &Res, FILE_CURRENT);
   return Res.QuadPart;
 }
 
-_off_t ftello(FILE* File) {
-  return static_cast<_off_t>(ftello64(File));
-}
-
 long ftell(FILE* File) {
-  return static_cast<long>(ftello64(File));
+  return static_cast<long>(_ftelli64(File));
 }
 
 size_t fread(void* __restrict__ DstBuf, size_t ElementSize, size_t Count, FILE* __restrict__ File) {
@@ -328,7 +320,11 @@ int fflush(FILE* _File) {
   UNIMPLEMENTED();
 }
 
-int __mingw_vfprintf(FILE* __restrict__, const char* __restrict__, va_list) {
+int fprintf(FILE* __restrict__, const char* __restrict__, ...) {
+  UNIMPLEMENTED();
+}
+
+int vfprintf(FILE* __restrict__, const char* __restrict__, va_list) {
   UNIMPLEMENTED();
 }
 
@@ -348,6 +344,10 @@ int fputc(int _Ch, FILE* _File) {
   UNIMPLEMENTED();
 }
 
+int fputs(const char * __restrict__ _Str,FILE * __restrict__ _File) {
+  UNIMPLEMENTED();
+}
+
 int getc(FILE* _File) {
   UNIMPLEMENTED();
 }
diff --git a/Source/Windows/Common/CRT/String.cpp b/Source/Windows/Common/CRT/String.cpp
index 7f04a1e132..0da6bc322a 100644
--- a/Source/Windows/Common/CRT/String.cpp
+++ b/Source/Windows/Common/CRT/String.cpp
@@ -32,11 +32,11 @@ char* strdup(const char* Src) {
   return _strdup(Src);
 }
 
-float __mingw_strtof(const char* __restrict__, char** __restrict__) {
+float strtof(const char* __restrict__, char** __restrict__) {
   UNIMPLEMENTED();
 }
 
-double __mingw_strtod(const char* __restrict__, char** __restrict__) {
+double strtod(const char* __restrict__, char** __restrict__) {
   UNIMPLEMENTED();
 }
 
@@ -60,7 +60,7 @@ long double strtold(const char* __restrict__, char** __restrict__) {
   UNIMPLEMENTED();
 }
 
-double __mingw_wcstod(const wchar_t* __restrict__ _Str, wchar_t** __restrict__ _EndPtr) {
+double wcstod(const wchar_t* __restrict__ _Str, wchar_t** __restrict__ _EndPtr) {
   UNIMPLEMENTED();
 }
 
@@ -68,7 +68,7 @@ long double wcstold(const wchar_t* __restrict__, wchar_t** __restrict__) {
   UNIMPLEMENTED();
 }
 
-float __mingw_wcstof(const wchar_t* __restrict__ nptr, wchar_t** __restrict__ endptr) {
+float wcstof(const wchar_t* __restrict__ nptr, wchar_t** __restrict__ endptr) {
   UNIMPLEMENTED();
 }
 
@@ -80,10 +80,14 @@ DLLEXPORT_FUNC(unsigned __int64, _strtoui64_l, (const char* _String, char** _End
   UNIMPLEMENTED();
 }
 
-int __mingw_vsscanf(const char* __restrict__ _Str, const char* __restrict__ Format, va_list argp) {
+int __stdio_common_vsscanf(unsigned __int64 options, const char *input, size_t length, const char *format, _locale_t locale, va_list valist) {
   UNIMPLEMENTED();
 }
 
+int __stdio_common_vswprintf(unsigned __int64 options, wchar_t *str, size_t len, const wchar_t *format, _locale_t locale, va_list valist) {
+  return _vsnwprintf(str, len, format, valist);
+}
+
 int __mingw_vsnwprintf(wchar_t* __restrict__ Dest, size_t Count, const wchar_t* __restrict__ Format, va_list Args) {
   int ret = _vsnwprintf(Dest, Count, Format, Args);
   return ret;
@@ -94,11 +98,11 @@ int __mingw_vsprintf(char* __restrict__ Dest, const char* __restrict__ Format, v
   return ret;
 }
 
-size_t strftime(char* __restrict__ _Buf, size_t _SizeInBytes, const char* __restrict__ _Format, const struct tm* __restrict__ _Tm) {
+DLLEXPORT_FUNC(size_t, _strftime_l, (char * __restrict__ Buf,size_t Max_size,const char * __restrict__ Format,const struct tm * __restrict__ Tm,_locale_t Locale)) {
   UNIMPLEMENTED();
 }
 
-int __mingw_vsnprintf(char* __restrict__ Dest, size_t Count, const char* __restrict__ Format, va_list Args) {
+int vsnprintf(char* __restrict__ Dest, size_t Count, const char* __restrict__ Format, va_list Args) {
   int ret = _vsnprintf(Dest, Count, Format, Args);
   if (ret == -1) {
     Dest[Count - 1] = '\0';
@@ -107,6 +111,15 @@ int __mingw_vsnprintf(char* __restrict__ Dest, size_t Count, const char* __restr
   return ret;
 }
 
+int snprintf(char *stream, size_t n, const char *format, ...)
+{
+  __builtin_va_list args;
+  __builtin_va_start(args, format);
+  int ret = vsnprintf(stream, n, format, args);
+  __builtin_va_end(args);
+  return ret;
+}
+
 char* setlocale(int _Category, const char* _Locale) {
   return Locale;
 }
@@ -166,10 +179,6 @@ DLLEXPORT_FUNC(errno_t, strerror_s, (char* _Buf, size_t _SizeInBytes, int _ErrNu
   UNIMPLEMENTED();
 }
 
-DLLEXPORT_FUNC(int, _sscanf_l, (const char* buffer, const char* format, _locale_t locale, ...)) {
-  UNIMPLEMENTED();
-}
-
 DLLEXPORT_FUNC(int, _isctype, (int _C, int _Type)) {
   UNIMPLEMENTED();
 }