diff --git a/dll/win32/msvcrt/cppexcept.h b/dll/win32/msvcrt/cppexcept.h
index e6afd1e871e..faae296dc82 100644
--- a/dll/win32/msvcrt/cppexcept.h
+++ b/dll/win32/msvcrt/cppexcept.h
@@ -24,6 +24,10 @@
 #include <fpieee.h>
 #include "cxx.h"
 
+#ifdef __REACTOS__
+#include "msvc_fwd_decl.h"
+#endif
+
 #define CXX_FRAME_MAGIC_VC6 0x19930520
 #define CXX_FRAME_MAGIC_VC7 0x19930521
 #define CXX_FRAME_MAGIC_VC8 0x19930522
@@ -137,7 +141,7 @@ typedef struct
 #define TYPE_FLAG_VOLATILE   2
 #define TYPE_FLAG_REFERENCE  8
 
-void WINAPI DECLSPEC_NORETURN _CxxThrowException(void*,const cxx_exception_type*);
+DECLSPEC_NORETURN void WINAPI _CxxThrowException(void*,const cxx_exception_type*);
 
 static inline BOOL is_cxx_exception( EXCEPTION_RECORD *rec )
 {
diff --git a/dll/win32/msvcrt/cxx.h b/dll/win32/msvcrt/cxx.h
index 8037d7def56..d39e869afbe 100644
--- a/dll/win32/msvcrt/cxx.h
+++ b/dll/win32/msvcrt/cxx.h
@@ -27,6 +27,9 @@
 #define RTTI_USE_RVA 1
 #endif
 
+#ifdef _MSC_VER
+#define __ASM_VTABLE(name,funcs)
+#else
 #ifdef _WIN64
 
 #define VTABLE_ADD_FUNC(name) "\t.quad " THISCALL_NAME(name) "\n"
@@ -52,6 +55,7 @@
             funcs "\n\t.text")
 
 #endif /* _WIN64 */
+#endif // _MSC_VER
 
 #ifndef RTTI_USE_RVA
 
@@ -481,6 +485,10 @@ static inline void *rtti_rva( const void *ptr, uintptr_t base )
 
 #endif
 
+#ifdef __REACTOS__
+void * __thiscall type_info_vector_dtor(type_info * _this, unsigned int flags);
+#endif
+
 #define CREATE_TYPE_INFO_VTABLE \
 DEFINE_THISCALL_WRAPPER(type_info_vector_dtor,8) \
 void * __thiscall type_info_vector_dtor(type_info * _this, unsigned int flags) \
diff --git a/dll/win32/msvcrt/except_i386.c b/dll/win32/msvcrt/except_i386.c
index 61e6e882dc1..fc6a7a2e940 100644
--- a/dll/win32/msvcrt/except_i386.c
+++ b/dll/win32/msvcrt/except_i386.c
@@ -601,8 +601,11 @@ int CDECL _except_handler3(PEXCEPTION_RECORD rec,
         rec->ExceptionCode, rec->ExceptionFlags, rec->ExceptionAddress,
         frame->handler, context, dispatcher);
 
+#ifdef _MSC_VER
+  __asm{ cld }
+#else
   __asm__ __volatile__ ("cld");
-
+#endif
   if (rec->ExceptionFlags & (EXCEPTION_UNWINDING | EXCEPTION_EXIT_UNWIND))
   {
     /* Unwinding the current frame */
diff --git a/dll/win32/msvcrt/include/conio.h b/dll/win32/msvcrt/include/conio.h
index 49c2b94962a..d9607613db6 100644
--- a/dll/win32/msvcrt/include/conio.h
+++ b/dll/win32/msvcrt/include/conio.h
@@ -46,11 +46,13 @@ static inline int kbhit(void) { return _kbhit(); }
 static inline int putch(int c) { return _putch(c); }
 static inline int ungetch(int c) { return _ungetch(c); }
 #ifdef _M_IX86
+#ifndef _MSC_VER
 static inline int inp(unsigned short i) { return _inp(i); }
 static inline unsigned short inpw(unsigned short i) { return _inpw(i); }
 static inline int outp(unsigned short i, int j) { return _outp(i, j); }
 static inline unsigned short outpw(unsigned short i, unsigned short j) { return _outpw(i, j); }
 #endif
+#endif
 
 #if defined(__GNUC__) && (__GNUC__ < 4)
 _ACRTIMP int __cdecl cprintf(const char*,...) __attribute__((alias("_cprintf"),format(printf,1,2)));
diff --git a/dll/win32/msvcrt/include/stdlib.h b/dll/win32/msvcrt/include/stdlib.h
index 9cb8ccb110a..25bb4949058 100644
--- a/dll/win32/msvcrt/include/stdlib.h
+++ b/dll/win32/msvcrt/include/stdlib.h
@@ -297,6 +297,7 @@ static inline unsigned __int64 __cdecl strtoull(const char *ptr, char **endptr,
 static inline void swab(char* src, char* dst, int len) { _swab(src, dst, len); }
 static inline char* ultoa(__msvcrt_ulong value, char* str, int radix) { return _ultoa(value, str, radix); }
 
+#ifndef __REACTOS__
 #ifdef __i386__
 static inline div_t __wine_msvcrt_div(int num, int denom)
 {
@@ -319,6 +320,7 @@ static inline ldiv_t __wine_msvcrt_ldiv(__msvcrt_long num, __msvcrt_long denom)
 #define div(num,denom) __wine_msvcrt_div(num,denom)
 #define ldiv(num,denom) __wine_msvcrt_ldiv(num,denom)
 #endif
+#endif /* !__REACTOS__ */
 
 #include <poppack.h>
 
diff --git a/dll/win32/msvcrt/include/string.h b/dll/win32/msvcrt/include/string.h
index 10fbf12e99e..b2bdeb1c01a 100644
--- a/dll/win32/msvcrt/include/string.h
+++ b/dll/win32/msvcrt/include/string.h
@@ -16,6 +16,10 @@
 #define _NLSCMP_DEFINED
 #endif
 
+#ifdef _MSC_VER
+#pragma function(strset)
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/dll/win32/msvcrt/include/sys/timeb.h b/dll/win32/msvcrt/include/sys/timeb.h
index e948daab012..66156ca6014 100644
--- a/dll/win32/msvcrt/include/sys/timeb.h
+++ b/dll/win32/msvcrt/include/sys/timeb.h
@@ -62,14 +62,14 @@ _ACRTIMP void __cdecl _ftime64(struct __timeb64*);
 #endif
 
 #ifdef _USE_32BIT_TIME_T
-static inline void __cdecl _ftime(struct _timeb *tb) { return _ftime32((struct __timeb32*)tb); }
+static inline void __cdecl _ftime(struct _timeb *tb) { _ftime32((struct __timeb32*)tb); }
 #else
-static inline void __cdecl _ftime(struct _timeb *tb) { return _ftime64((struct __timeb64*)tb); }
+static inline void __cdecl _ftime(struct _timeb *tb) { _ftime64((struct __timeb64*)tb); }
 #endif
 
 #define timeb _timeb
 
-static inline void ftime(struct _timeb* ptr) { return _ftime(ptr); }
+static inline void ftime(struct _timeb* ptr) { _ftime(ptr); }
 
 #include <poppack.h>
 
diff --git a/dll/win32/msvcrt/math.c b/dll/win32/msvcrt/math.c
index be345fb7a4a..0ec4fde011b 100644
--- a/dll/win32/msvcrt/math.c
+++ b/dll/win32/msvcrt/math.c
@@ -52,6 +52,10 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
+#ifdef _MSC_VER
+#pragma function(abs,labs,div,ldiv)
+#endif
+
 #undef div
 #undef ldiv
 
@@ -699,13 +703,19 @@ intmax_t CDECL imaxabs( intmax_t n )
 /*********************************************************************
  *		_abs64 (MSVCRT.@)
  */
+#ifdef _MSC_VER
+#pragma function(_abs64)
+#endif
 __int64 CDECL _abs64( __int64 n )
 {
     return n >= 0 ? n : -n;
 }
 
 #if defined(__i386__) || defined(__x86_64__)
-
+#ifdef _MSC_VER
+#define get_mxcsr() _mm_getcsr()
+#define set_mxcsr(val) _mm_setcsr(val)
+#else
 static unsigned int get_mxcsr(void)
 {
     unsigned int ret;
@@ -727,6 +737,7 @@ static void set_mxcsr( unsigned int val )
     __asm__ __volatile__( "ldmxcsr %0" : : "m" (val) );
 #endif
 }
+#endif
 
 static void _setfp_sse( unsigned int *cw, unsigned int cw_mask,
         unsigned int *sw, unsigned int sw_mask )
@@ -826,7 +837,7 @@ static void _setfp_sse( unsigned int *cw, unsigned int cw_mask,
 static void _setfp( unsigned int *cw, unsigned int cw_mask,
         unsigned int *sw, unsigned int sw_mask )
 {
-#if (defined(__GNUC__) || defined(__clang__)) && defined(__i386__)
+#if (defined(__GNUC__) || defined(__clang__) || defined(_MSC_VER)) && defined(__i386__)
     unsigned long oldcw = 0, newcw = 0;
     unsigned long oldsw = 0, newsw = 0;
     unsigned int flags;
@@ -836,7 +847,11 @@ static void _setfp( unsigned int *cw, unsigned int cw_mask,
 
     if (sw)
     {
+#ifdef _MSC_VER
+        __asm { fstsw newsw }
+#else
         __asm__ __volatile__( "fstsw %0" : "=m" (newsw) );
+#endif
         oldsw = newsw;
 
         flags = 0;
@@ -861,7 +876,11 @@ static void _setfp( unsigned int *cw, unsigned int cw_mask,
 
     if (cw)
     {
-        __asm__ __volatile__( "fstcw %0" : "=m" (newcw) );
+#ifdef _MSC_VER
+        __asm { fstcw newcw }
+#else
+       __asm__ __volatile__( "fstcw %0" : "=m" (newcw) );
+#endif
         oldcw = newcw;
 
         flags = 0;
@@ -928,18 +947,34 @@ static void _setfp( unsigned int *cw, unsigned int cw_mask,
 
         assert(cw);
 
+#ifdef _MSC_VER
+        __asm { fnstenv fenv }
+#else
         __asm__ __volatile__( "fnstenv %0" : "=m" (fenv) );
+#endif
         fenv.control_word = newcw;
         fenv.status_word = newsw;
+#ifdef _MSC_VER
+        __asm { fldenv fenv }
+#else
         __asm__ __volatile__( "fldenv %0" : : "m" (fenv) : "st", "st(1)",
                 "st(2)", "st(3)", "st(4)", "st(5)", "st(6)", "st(7)" );
+#endif
         return;
     }
 
     if (oldsw != newsw)
+#ifdef _MSC_VER
+        __asm { fnclex }
+#else
         __asm__ __volatile__( "fnclex" );
+#endif
     if (oldcw != newcw)
+#ifdef _MSC_VER
+        __asm { fldcw newcw }
+#else
         __asm__ __volatile__( "fldcw %0" : : "m" (newcw) );
+#endif
 #elif defined(__x86_64__)
     _setfp_sse(cw, cw_mask, sw, sw_mask);
 #elif defined(__aarch64__)
@@ -2012,6 +2047,7 @@ int CDECL _gcvt_s(char *buff, size_t size, double number, int digits)
 
 #include <stdlib.h> /* div_t, ldiv_t */
 
+#ifndef __REACTOS__
 /*********************************************************************
  *		div (MSVCRT.@)
  * VERSION
@@ -2078,6 +2114,7 @@ ldiv_t CDECL ldiv(__msvcrt_long num, __msvcrt_long denom)
     return ret;
 }
 #endif /* ifdef __i386__ */
+#endif /* !__REACTOS__ */
 
 #if _MSVCR_VER>=100
 /*********************************************************************
@@ -2325,6 +2362,7 @@ void _safe_fprem1(void)
   TRACE("(): stub\n");
 }
 
+#ifndef __REACTOS__
 /***********************************************************************
  *		__libm_sse2_acos   (MSVCRT.@)
  */
@@ -2580,6 +2618,7 @@ void __cdecl __libm_sse2_sqrt_precise(void)
     }
     __asm__ __volatile__( "sqrtsd %xmm0, %xmm0" );
 }
+#endif /* !__REACTOS__ */
 #endif  /* __i386__ */
 
 #if _MSVCR_VER>=120
diff --git a/dll/win32/msvcrt/misc.c b/dll/win32/msvcrt/misc.c
index 559bb7288b3..6977406e428 100644
--- a/dll/win32/msvcrt/misc.c
+++ b/dll/win32/msvcrt/misc.c
@@ -31,6 +31,10 @@ WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
 static unsigned int output_format;
 
+#ifdef _MSC_VER
+#pragma function(_byteswap_ushort, _byteswap_ulong, _byteswap_uint64)
+#endif
+
 /*********************************************************************
  *		_beep (MSVCRT.@)
  */
diff --git a/dll/win32/msvcrt/msvc_fwd_decl.h b/dll/win32/msvcrt/msvc_fwd_decl.h
new file mode 100644
index 00000000000..3b51fce986a
--- /dev/null
+++ b/dll/win32/msvcrt/msvc_fwd_decl.h
@@ -0,0 +1,45 @@
+
+#define bad_cast exception
+#define bad_typeid exception
+#define __non_rtti_object exception
+
+exception* __thiscall exception_ctor(exception* _this, const char** name);
+exception* __thiscall exception_copy_ctor(exception* _this, const exception* rhs);
+exception* __thiscall exception_ctor_noalloc(exception* _this, char** name, int noalloc);
+exception* __thiscall exception_default_ctor(exception* _this);
+exception* __thiscall exception_opequals(exception* _this, const exception* rhs);
+void __thiscall exception_dtor(exception* _this);
+void* __thiscall exception_vector_dtor(exception* _this, unsigned int flags);
+void* __thiscall exception_scalar_dtor(exception* _this, unsigned int flags);
+const char* __thiscall exception_what(exception* _this);
+bad_typeid* __thiscall bad_typeid_copy_ctor(bad_typeid* _this, const bad_typeid* rhs);
+bad_typeid* __thiscall bad_typeid_ctor(bad_typeid* _this, const char* name);
+bad_typeid* __thiscall bad_typeid_default_ctor(bad_typeid* _this);
+void __thiscall bad_typeid_dtor(bad_typeid* _this);
+bad_typeid* __thiscall bad_typeid_opequals(bad_typeid* _this, const bad_typeid* rhs);
+void* __thiscall bad_typeid_vector_dtor(bad_typeid* _this, unsigned int flags);
+void* __thiscall bad_typeid_scalar_dtor(bad_typeid* _this, unsigned int flags);
+__non_rtti_object* __thiscall __non_rtti_object_copy_ctor(__non_rtti_object* _this, const __non_rtti_object* rhs);
+__non_rtti_object* __thiscall __non_rtti_object_ctor(__non_rtti_object* _this, const char* name);
+void __thiscall __non_rtti_object_dtor(__non_rtti_object* _this);
+__non_rtti_object* __thiscall __non_rtti_object_opequals(__non_rtti_object* _this, const __non_rtti_object* rhs);
+void* __thiscall __non_rtti_object_vector_dtor(__non_rtti_object* _this, unsigned int flags);
+void* __thiscall __non_rtti_object_scalar_dtor(__non_rtti_object* _this, unsigned int flags);
+bad_cast* __thiscall bad_cast_ctor(bad_cast* _this, const char** name);
+bad_cast* __thiscall bad_cast_copy_ctor(bad_cast* _this, const bad_cast* rhs);
+bad_cast* __thiscall bad_cast_ctor_charptr(bad_cast* _this, const char* name);
+bad_cast* __thiscall bad_cast_default_ctor(bad_cast* _this);
+void __thiscall bad_cast_dtor(bad_cast* _this);
+void* __thiscall bad_cast_vector_dtor(bad_cast* _this, unsigned int flags);
+void* __thiscall bad_cast_scalar_dtor(bad_cast* _this, unsigned int flags);
+bad_cast* __thiscall bad_cast_opequals(bad_cast* _this, const bad_cast* rhs);
+int __thiscall type_info_opequals_equals(type_info* _this, const type_info* rhs);
+int __thiscall type_info_opnot_equals(type_info* _this, const type_info* rhs);
+int __thiscall type_info_before(type_info* _this, const type_info *rhs);
+void __thiscall type_info_dtor(type_info* _this);
+const char* __thiscall type_info_name(type_info* _this);
+const char* __thiscall type_info_raw_name(type_info* _this);
+
+#undef bad_cast
+#undef bad_typeid
+#undef __non_rtti_object
diff --git a/dll/win32/msvcrt/printf.h b/dll/win32/msvcrt/printf.h
index be30d6ae719..561678f6819 100644
--- a/dll/win32/msvcrt/printf.h
+++ b/dll/win32/msvcrt/printf.h
@@ -605,7 +605,11 @@ static inline int FUNC_NAME(pf_output_fp)(FUNC_NAME(puts_clbk) pf_puts, void *pu
         BOOL standard_rounding)
 {
     int e2, e10 = 0, round_pos, round_limb, radix_pos, first_limb_len, i, len, r, ret;
+#ifdef _MSC_VER
+    BYTE bnum_data[FIELD_OFFSET(struct bnum, data) + BNUM_PREC64 * sizeof(DWORD)];
+#else
     BYTE bnum_data[FIELD_OFFSET(struct bnum, data[BNUM_PREC64])];
+#endif
     struct bnum *b = (struct bnum*)bnum_data;
     APICHAR buf[LIMB_DIGITS + 1];
     BOOL trim_tail = FALSE, round_up = FALSE;
diff --git a/dll/win32/msvcrt/string.c b/dll/win32/msvcrt/string.c
index a5d04c94583..1fd3b13754c 100644
--- a/dll/win32/msvcrt/string.c
+++ b/dll/win32/msvcrt/string.c
@@ -36,6 +36,10 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
+#ifdef _MSC_VER
+#pragma function(_strset,memchr,memcmp,memcpy,memset,strcat,strcmp,strcpy,strlen)
+#endif
+
 /*********************************************************************
  *		_mbsdup (MSVCRT.@)
  *		_strdup (MSVCRT.@)
@@ -978,13 +982,21 @@ struct fpnum fpnum_parse(wchar_t (*get)(void *ctx), void (*unget)(void *ctx),
        void *ctx, pthreadlocinfo locinfo, BOOL ldouble)
 {
     if(!ldouble) {
+#ifdef _MSC_VER
+        BYTE bnum_data[FIELD_OFFSET(struct bnum, data) + BNUM_PREC64 * sizeof(DWORD)];
+#else
         BYTE bnum_data[FIELD_OFFSET(struct bnum, data[BNUM_PREC64])];
+#endif
         struct bnum *b = (struct bnum*)bnum_data;
 
         b->size = BNUM_PREC64;
         return fpnum_parse_bnum(get, unget, ctx, locinfo, ldouble, b);
     } else {
+#ifdef _MSC_VER
+        BYTE bnum_data[FIELD_OFFSET(struct bnum, data) + BNUM_PREC80 * sizeof(DWORD)];
+#else
         BYTE bnum_data[FIELD_OFFSET(struct bnum, data[BNUM_PREC80])];
+#endif
         struct bnum *b = (struct bnum*)bnum_data;
 
         b->size = BNUM_PREC80;
diff --git a/dll/win32/msvcrt/wcs.c b/dll/win32/msvcrt/wcs.c
index 1b7bc3e54e0..af9da19d8d7 100644
--- a/dll/win32/msvcrt/wcs.c
+++ b/dll/win32/msvcrt/wcs.c
@@ -33,6 +33,10 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
+#ifdef _MSC_VER
+#pragma function(_wcsset,wcscat,wcscmp,wcscpy,wcslen)
+#endif
+
 typedef struct
 {
     enum { LEN_DEFAULT, LEN_SHORT, LEN_LONG } IntegerLength;