diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 0f57555e454..884289175c0 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1134,7 +1134,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 072cef0f0c9..89bb35c7dba 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1491,7 +1491,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 55a0a4b1d2d..1be83715d23 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1502,7 +1502,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 38d157f8a9a..78172dbc104 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -806,7 +806,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 58cb3ef2e92..c1736877ff5 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -784,7 +784,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/msvcrt/mbcs.c b/dlls/msvcrt/mbcs.c
index 245dc843ba2..38ace70cd7e 100644
--- a/dlls/msvcrt/mbcs.c
+++ b/dlls/msvcrt/mbcs.c
@@ -992,6 +992,50 @@ int CDECL _mbscpy_s(unsigned char *dst, size_t size, const unsigned char *src)
     return _mbscpy_s_l(dst, size, src, NULL);
 }
 
+/*********************************************************************
+ *              _mbsnbcpy_l(MSVCRT.@)
+ * REMARKS
+ *  Like strncpy this function doesn't enforce the string to be
+ *  NUL-terminated
+ */
+unsigned char* CDECL _mbsnbcpy_l(unsigned char* dst, const unsigned char* src, size_t n, _locale_t locale)
+{
+    unsigned char* ret = dst;
+    pthreadmbcinfo mbcinfo;
+
+    if (!n)
+        return dst;
+    if (!MSVCRT_CHECK_PMT(dst && src))
+        return NULL;
+    if (locale)
+        mbcinfo = locale->mbcinfo;
+    else
+        mbcinfo = get_mbcinfo();
+    if (mbcinfo->ismbcodepage)
+    {
+        BOOL is_lead = FALSE;
+        while (*src && n)
+        {
+            is_lead = (!is_lead && _ismbblead_l(*src, locale));
+            n--;
+            *dst++ = *src++;
+        }
+
+        if (is_lead) /* if string ends with a lead, remove it */
+            *(dst - 1) = 0;
+    }
+    else
+    {
+        while (n)
+        {
+            n--;
+            if (!(*dst++ = *src++)) break;
+        }
+    }
+    while (n--) *dst++ = 0;
+    return ret;
+}
+
 /*********************************************************************
  *              _mbsnbcpy(MSVCRT.@)
  * REMARKS
@@ -1000,32 +1044,7 @@ int CDECL _mbscpy_s(unsigned char *dst, size_t size, const unsigned char *src)
  */
 unsigned char* CDECL _mbsnbcpy(unsigned char* dst, const unsigned char* src, size_t n)
 {
-  unsigned char* ret = dst;
-  if(!n)
-    return dst;
-  if(get_mbcinfo()->ismbcodepage)
-  {
-    BOOL is_lead = FALSE;
-    while (*src && n)
-    {
-      is_lead = (!is_lead && _ismbblead(*src));
-      n--;
-      *dst++ = *src++;
-    }
-
-    if (is_lead) /* if string ends with a lead, remove it */
-	*(dst - 1) = 0;
-  }
-  else
-  {
-    while (n)
-    {
-        n--;
-        if (!(*dst++ = *src++)) break;
-    }
-  }
-  while (n--) *dst++ = 0;
-  return ret;
+    return _mbsnbcpy_l(dst, src, n, NULL);
 }
 
 /*********************************************************************
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 738279a2cd3..998bd7268ca 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -755,7 +755,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-# stub _mbsnbcpy_l(ptr str long ptr)
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index 46cea0359b4..25c3e5ac766 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -650,7 +650,7 @@
 @ cdecl _mbsnbcoll(str str long)
 @ cdecl _mbsnbcoll_l(str str long ptr)
 @ cdecl _mbsnbcpy(ptr str long)
-@ stub _mbsnbcpy_l
+@ cdecl _mbsnbcpy_l(ptr str long ptr)
 @ cdecl _mbsnbcpy_s(ptr long str long)
 @ cdecl _mbsnbcpy_s_l(ptr long str long ptr)
 @ cdecl _mbsnbicmp(str str long)
@@ -1219,7 +1219,7 @@
 @ cdecl _o__mbsnbcoll(str str long) _mbsnbcoll
 @ cdecl _o__mbsnbcoll_l(str str long ptr) _mbsnbcoll_l
 @ cdecl _o__mbsnbcpy(ptr str long) _mbsnbcpy
-@ stub _o__mbsnbcpy_l
+@ cdecl _o__mbsnbcpy_l(ptr str long ptr) _mbsnbcpy_l
 @ cdecl _o__mbsnbcpy_s(ptr long str long) _mbsnbcpy_s
 @ cdecl _o__mbsnbcpy_s_l(ptr long str long ptr) _mbsnbcpy_s_l
 @ cdecl _o__mbsnbicmp(str str long) _mbsnbicmp