diff --git a/mak/MANIFEST b/mak/MANIFEST
index af2dfa21c8..abe9f591b3 100644
--- a/mak/MANIFEST
+++ b/mak/MANIFEST
@@ -183,6 +183,8 @@ MANIFEST=\
 	src\core\sys\windows\threadaux.d \
 	src\core\sys\windows\windows.d \
 	src\core\sys\windows\winsock2.d \
+	src\core\sys\windows\stdio_msvc12.d \
+	src\core\sys\windows\stdio_msvc14.d \
 	\
 	src\gc\bits.d \
 	src\gc\config.d \
diff --git a/src/core/stdc/stdio.d b/src/core/stdc/stdio.d
index e78034fda6..bb284f3cb3 100644
--- a/src/core/stdc/stdio.d
+++ b/src/core/stdc/stdio.d
@@ -76,7 +76,7 @@ else version( CRuntime_Microsoft )
         FOPEN_MAX    = 20,
         ///
         FILENAME_MAX = 260,
-        ///
+        /// Actually int.max since Visual Studio 2015.
         TMP_MAX      = 32767,
         ///
         _SYS_OPEN    = 20,      // non-standard
@@ -84,11 +84,11 @@ else version( CRuntime_Microsoft )
 
     ///
     enum int     _NFILE     = 512;       // non-standard
-    ///
+    /// Removed since Visual Studio 2015.
     enum string  _P_tmpdir  = "\\"; // non-standard
-    ///
+    /// Removed since Visual Studio 2015.
     enum wstring _wP_tmpdir = "\\"; // non-standard
-    ///
+    /// Actually 260 since Visual Studio 2015.
     enum int     L_tmpnam   = _P_tmpdir.length + 12;
 }
 else version( linux )
@@ -264,14 +264,7 @@ else version( CRuntime_Microsoft )
     ///
     struct _iobuf
     {
-        char* _ptr;
-        int   _cnt;
-        char* _base;
-        int   _flag;
-        int   _file;
-        int   _charbuf;
-        int   _bufsiz;
-        char* _tmpfname;
+        void* undefined;
     }
 
     ///
@@ -549,32 +542,28 @@ else version( CRuntime_Microsoft )
         _IOLBF   = 0x40,
         ///
         _IONBF   = 4,
-        ///
+        /// Removed since Visual Studio 2015.
         _IOREAD  = 1,     // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOWRT   = 2,     // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOMYBUF = 8,     // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOEOF   = 0x10,  // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOERR   = 0x20,  // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOSTRG  = 0x40,  // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IORW    = 0x80,  // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOAPP   = 0x200, // non-standard
-        ///
+        /// Removed since Visual Studio 2015.
         _IOAPPEND = 0x200, // non-standard
     }
 
     extern shared void function() _fcloseallp;
 
-    private extern shared FILE[_NFILE] _iob;
-
-    shared(FILE)* __iob_func();
-
     ///
     shared FILE* stdin;  // = &__iob_func()[0];
     ///
@@ -942,66 +931,34 @@ else version( CRuntime_DigitalMars )
 else version( CRuntime_Microsoft )
 {
   // No unsafe pointer manipulation.
-  extern (D) @trusted
+  @trusted
   {
       ///
-    void rewind(FILE* stream)   { fseek(stream,0L,SEEK_SET); stream._flag = stream._flag & ~_IOERR; }
+    void rewind(FILE* stream);
     ///
-    pure void clearerr(FILE* stream) { stream._flag = stream._flag & ~(_IOERR|_IOEOF);                 }
+    pure void clearerr(FILE* stream);
     ///
-    pure int  feof(FILE* stream)     { return stream._flag&_IOEOF;                       }
+    pure int  feof(FILE* stream);
     ///
-    pure int  ferror(FILE* stream)   { return stream._flag&_IOERR;                       }
+    pure int  ferror(FILE* stream);
     ///
-    pure int  fileno(FILE* stream)   { return stream._file;                              }
+    pure int  fileno(FILE* stream);
   }
-  ///
-    int   _snprintf(char* s, size_t n, in char* fmt, ...);
-    ///
-    alias _snprintf snprintf;
 
+  ///
+    int _snprintf(char* s, size_t n, in char* format, ...);
     ///
-    int   _vsnprintf(char* s, size_t n, in char* format, va_list arg);
-    ///
-    alias _vsnprintf vsnprintf;
-
-    ///
-    uint _set_output_format(uint format);
-    ///
-    enum _TWO_DIGIT_EXPONENT = 1;
+    int  snprintf(char* s, size_t n, in char* format, ...);
 
     ///
-    int _filbuf(FILE *fp);
+    int _vsnprintf(char* s, size_t n, in char* format, va_list arg);
     ///
-    int _flsbuf(int c, FILE *fp);
+    int  vsnprintf(char* s, size_t n, in char* format, va_list arg);
 
     ///
-    int _fputc_nolock(int c, FILE *fp)
-    {
-        fp._cnt = fp._cnt - 1;
-        if (fp._cnt >= 0)
-        {
-            *fp._ptr = cast(char)c;
-            fp._ptr = fp._ptr + 1;
-            return cast(char)c;
-        }
-        else
-            return _flsbuf(c, fp);
-    }
-
+    int _fputc_nolock(int c, FILE *fp);
     ///
-    int _fgetc_nolock(FILE *fp)
-    {
-        fp._cnt = fp._cnt - 1;
-        if (fp._cnt >= 0)
-        {
-            char c = *fp._ptr;
-            fp._ptr = fp._ptr + 1;
-            return c;
-        }
-        else
-            return _filbuf(fp);
-    }
+    int _fgetc_nolock(FILE *fp);
 
     ///
     int _lock_file(FILE *fp);
diff --git a/src/rt/dmain2.d b/src/rt/dmain2.d
index 77edcd592b..8392d3633e 100644
--- a/src/rt/dmain2.d
+++ b/src/rt/dmain2.d
@@ -57,6 +57,11 @@ version (OSX)
     extern (C) __gshared void* __osx_stack_end = cast(void*)0xC0000000;
 }
 
+version(CRuntime_Microsoft)
+{
+    extern(C) void init_msvc();
+}
+
 /***********************************
  * These are a temporary means of providing a GC hook for DLL use.  They may be
  * replaced with some other similar functionality later.
@@ -270,13 +275,7 @@ extern (C) int _d_run_main(int argc, char **argv, MainFunc mainFunc)
     }
     version (CRuntime_Microsoft)
     {
-        auto fp = __iob_func();
-        stdin = &fp[0];
-        stdout = &fp[1];
-        stderr = &fp[2];
-
-        // ensure that sprintf generates only 2 digit exponent when writing floating point values
-        _set_output_format(_TWO_DIGIT_EXPONENT);
+        init_msvc();
 
         // enable full precision for reals
         version(Win64)
diff --git a/src/rt/stdio_msvc.c b/src/rt/stdio_msvc.c
new file mode 100644
index 0000000000..a81042643f
--- /dev/null
+++ b/src/rt/stdio_msvc.c
@@ -0,0 +1,147 @@
+/**
+* This module provides MS VC runtime helper function that
+* wrap differences between different versions of the MS C runtime
+*
+* Copyright: Copyright Digital Mars 2015.
+* License: Distributed under the
+*      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
+*    (See accompanying file LICENSE)
+* Source:    $(DRUNTIMESRC rt/_stdio_msvc.d)
+* Authors:   Rainer Schuetze
+*/
+
+struct _iobuf
+{
+    char* _ptr;
+    int   _cnt;  // _cnt and _base exchanged for VS2015
+    char* _base;
+    int   _flag;
+    int   _file;
+    int   _charbuf;
+    int   _bufsiz;
+    char* _tmpfname;
+    // additional members in VS2015
+};
+
+typedef struct _iobuf FILE;
+extern FILE* stdin;
+extern FILE* stdout;
+extern FILE* stderr;
+
+FILE* __acrt_iob_func(int hnd);     // VS2015+
+FILE* __iob_func();                 // VS2013-
+
+int _set_output_format(int format); // VS2013-
+
+//extern const char* __acrt_iob_func;
+extern const char* _nullfunc = 0;
+
+#pragma comment(linker, "/alternatename:__acrt_iob_func=_nullfunc")
+#pragma comment(linker, "/alternatename:__iob_func=_nullfunc")
+#pragma comment(linker, "/alternatename:_set_output_format=_nullfunc")
+
+void init_msvc()
+{
+    if (&__acrt_iob_func != (void*) &_nullfunc)
+    {
+        stdin = __acrt_iob_func(0);
+        stdout = __acrt_iob_func(1);
+        stderr = __acrt_iob_func(2);
+    }
+    else if (&__iob_func != (void*) &_nullfunc)
+    {
+        FILE* fp = __iob_func();
+        stdin = fp;
+        stdout = fp + 1;
+        stderr = fp + 2;
+    }
+    if (&_set_output_format != (void*) &_nullfunc)
+    {
+        const int _TWO_DIGIT_EXPONENT = 1;
+        _set_output_format(_TWO_DIGIT_EXPONENT);
+    }
+}
+
+// VS2015+ provides C99-conformant (v)snprintf functions, so weakly
+// link to legacy _(v)snprintf (not C99-conformant!) for VS2013- only
+
+#pragma comment(linker, "/alternatename:snprintf=_snprintf")
+#pragma comment(linker, "/alternatename:vsnprintf=_vsnprintf")
+
+// VS2013- implements these functions as macros, VS2015+ provides symbols
+
+#pragma comment(linker, "/alternatename:_fputc_nolock=_msvc_fputc_nolock")
+#pragma comment(linker, "/alternatename:_fgetc_nolock=_msvc_fgetc_nolock")
+#pragma comment(linker, "/alternatename:rewind=_msvc_rewind")
+#pragma comment(linker, "/alternatename:clearerr=_msvc_clearerr")
+#pragma comment(linker, "/alternatename:feof=_msvc_feof")
+#pragma comment(linker, "/alternatename:ferror=_msvc_ferror")
+#pragma comment(linker, "/alternatename:fileno=_msvc_fileno")
+
+// VS2013- helper functions
+int _filbuf(FILE* fp);
+int _flsbuf(int c, FILE* fp);
+
+#pragma comment(linker, "/alternatename:_filbuf=_nullfunc")
+#pragma comment(linker, "/alternatename:_flsbuf=_nullfunc")
+
+int _msvc_fputc_nolock(int c, FILE* fp)
+{
+    fp->_cnt = fp->_cnt - 1;
+    if (fp->_cnt >= 0)
+    {
+        *(fp->_ptr) = (char)c;
+        fp->_ptr = fp->_ptr + 1;
+        return (char)c;
+    }
+    else
+        return _flsbuf(c, fp);
+}
+
+int _msvc_fgetc_nolock(FILE* fp)
+{
+    fp->_cnt = fp->_cnt - 1;
+    if (fp->_cnt >= 0)
+    {
+        char c = *(fp->_ptr);
+        fp->_ptr = fp->_ptr + 1;
+        return c;
+    }
+    else
+        return _filbuf(fp);
+}
+
+enum
+{
+    SEEK_SET = 0,
+    _IOEOF   = 0x10,
+    _IOERR   = 0x20
+};
+
+int fseek(FILE* fp, long off, int whence);
+
+void _msvc_rewind(FILE* stream)
+{
+    fseek(stream, 0L, SEEK_SET);
+    stream->_flag = stream->_flag & ~_IOERR;
+}
+
+void _msvc_clearerr(FILE* stream)
+{
+    stream->_flag = stream->_flag & ~(_IOERR | _IOEOF);
+}
+
+int  _msvc_feof(FILE* stream)
+{
+    return stream->_flag & _IOEOF;
+}
+
+int  _msvc_ferror(FILE* stream)
+{
+    return stream->_flag & _IOERR;
+}
+
+int  _msvc_fileno(FILE* stream)
+{
+    return stream->_file;
+}
diff --git a/win64.mak b/win64.mak
index b55d433d18..86871c2c8e 100644
--- a/win64.mak
+++ b/win64.mak
@@ -41,8 +41,8 @@ $(mak\SRCS)
 # NOTE: a pre-compiled minit.obj has been provided in dmd for Win32 and
 #       minit.asm is not used by dmd for Linux
 
-OBJS= errno_c.obj
-OBJS_TO_DELETE= errno_c.obj
+OBJS= errno_c.obj stdio_msvc_$(MODEL).obj
+OBJS_TO_DELETE= errno_c.obj stdio_msvc_$(MODEL).obj
 
 ######################## Doc .html file generation ##############################
 
@@ -640,6 +640,10 @@ $(IMPDIR)\etc\linux\memoryerror.d : src\etc\linux\memoryerror.d
 errno_c.obj : src\core\stdc\errno.c
 	$(CC) -c $(CFLAGS) src\core\stdc\errno.c -Foerrno_c.obj
 
+stdio_msvc_$(MODEL).obj : src\rt\stdio_msvc.c win64.mak
+	$(CC) -c -Fo$@ $(CFLAGS) src\rt\stdio_msvc.c
+
+
 src\rt\minit.obj : src\rt\minit.asm
 	$(CC) -c $(CFLAGS) src\rt\minit.asm
 
@@ -648,6 +652,7 @@ src\rt\minit.obj : src\rt\minit.asm
 $(GCSTUB) : src\gcstub\gc.d win64.mak
 	$(DMD) -c -of$(GCSTUB) src\gcstub\gc.d $(DFLAGS)
 
+
 ################### Library generation #########################
 
 $(DRUNTIME): $(OBJS) $(SRCS) win64.mak