diff --git a/dlls/msvcp90/msvcp90.spec b/dlls/msvcp90/msvcp90.spec
index 82f02ec0729..8e10b85a7a0 100644
--- a/dlls/msvcp90/msvcp90.spec
+++ b/dlls/msvcp90/msvcp90.spec
@@ -1724,8 +1724,8 @@
 @ stub -arch=win64 ??X?$complex@O@std@@QEAAAEAV01@AEBV01@@Z
 @ thiscall -arch=win32 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@ABV01@@Z(ptr ptr) MSVCP_basic_string_char_append
 @ cdecl -arch=win64 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV01@AEBV01@@Z(ptr ptr) MSVCP_basic_string_char_append
-@ stub -arch=win32 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@D@Z
-@ stub -arch=win64 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV01@D@Z
+@ thiscall -arch=win32 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@D@Z(ptr long) MSVCP_basic_string_char_append_ch
+@ cdecl -arch=win64 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV01@D@Z(ptr long) MSVCP_basic_string_char_append_ch
 @ stub -arch=win32 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@PBD@Z
 @ stub -arch=win64 ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV01@PEBD@Z
 @ stub -arch=win32 ??Y?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV01@ABV01@@Z
@@ -1738,8 +1738,8 @@
 @ cdecl -arch=win64 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV01@AEBV01@@Z(ptr ptr) MSVCP_basic_string_wchar_append
 @ stub -arch=win32 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV01@PB_W@Z
 @ stub -arch=win64 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV01@PEB_W@Z
-@ stub -arch=win32 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV01@_W@Z
-@ stub -arch=win64 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV01@_W@Z
+@ thiscall -arch=win32 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV01@_W@Z(ptr long) MSVCP_basic_string_wchar_append_ch
+@ cdecl -arch=win64 ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV01@_W@Z(ptr long) MSVCP_basic_string_wchar_append_ch
 @ stub -arch=win32 ??Y?$complex@M@std@@QAEAAV01@ABM@Z
 @ stub -arch=win64 ??Y?$complex@M@std@@QEAAAEAV01@AEBM@Z
 @ stub -arch=win32 ??Y?$complex@M@std@@QAEAAV01@ABV01@@Z
@@ -2920,7 +2920,7 @@
 @ cdecl -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@AEBV12@@Z(ptr ptr) MSVCP_basic_string_char_append
 @ thiscall -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z(ptr ptr long long) MSVCP_basic_string_char_append_substr
 @ cdecl -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@AEBV12@_K1@Z(ptr ptr long long) MSVCP_basic_string_char_append_substr
-@ stub -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ID@Z
+@ thiscall -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ID@Z(ptr long long) MSVCP_basic_string_char_append_len_ch
 @ stub -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@PEBD0@Z
 @ stub -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@PBD0@Z
 @ cdecl -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@PEBD@Z(ptr str) MSVCP_basic_string_char_append_cstr
@@ -2929,7 +2929,7 @@
 @ thiscall -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@PBDI@Z(ptr str long) MSVCP_basic_string_char_append_cstr_len
 @ stub -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@V?$_String_const_iterator@DU?$char_traits@D@std@@V?$allocator@D@2@@2@0@Z
 @ stub -arch=win32 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@V?$_String_const_iterator@DU?$char_traits@D@std@@V?$allocator@D@2@@2@0@Z
-@ stub -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@_KD@Z
+@ cdecl -arch=win64 ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@_KD@Z(ptr long long) MSVCP_basic_string_char_append_len_ch
 @ stub -arch=win32 ?append@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV12@ABV12@@Z
 @ stub -arch=win64 ?append@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QEAAAEAV12@AEBV12@@Z
 @ stub -arch=win32 ?append@?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QAEAAV12@ABV12@II@Z
@@ -2948,7 +2948,7 @@
 @ cdecl -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@AEBV12@@Z(ptr ptr) MSVCP_basic_string_wchar_append
 @ thiscall -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@ABV12@II@Z(ptr ptr long long) MSVCP_basic_string_wchar_append_substr
 @ cdecl -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@AEBV12@_K1@Z(ptr ptr long long) MSVCP_basic_string_wchar_append_substr
-@ stub -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@I_W@Z
+@ thiscall -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@I_W@Z(ptr long long) MSVCP_basic_string_wchar_append_len_ch
 @ stub -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@PEB_W0@Z
 @ stub -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@PB_W0@Z
 @ cdecl -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@PEB_W@Z(ptr wstr) MSVCP_basic_string_wchar_append_cstr
@@ -2957,7 +2957,7 @@
 @ thiscall -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@PB_WI@Z(ptr wstr long) MSVCP_basic_string_wchar_append_cstr_len
 @ stub -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@V?$_String_const_iterator@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@2@0@Z
 @ stub -arch=win32 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@V?$_String_const_iterator@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@2@0@Z
-@ stub -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@_K_W@Z
+@ cdecl -arch=win64 ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@_K_W@Z(ptr long long) MSVCP_basic_string_wchar_append_len_ch
 @ thiscall -arch=win32 ?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@@Z(ptr ptr) MSVCP_basic_string_char_assign
 @ cdecl -arch=win64 ?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@AEBV12@@Z(ptr ptr) MSVCP_basic_string_char_assign
 @ thiscall -arch=win32 ?assign@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ABV12@II@Z(ptr ptr long long) MSVCP_basic_string_char_assign_substr
diff --git a/dlls/msvcp90/string.c b/dlls/msvcp90/string.c
index 23b5c3b984f..a54f3231a62 100644
--- a/dlls/msvcp90/string.c
+++ b/dlls/msvcp90/string.c
@@ -874,6 +874,34 @@ basic_string_char* __thiscall MSVCP_basic_string_char_append_cstr(
             MSVCP_char_traits_char_length(append));
 }
 
+/* ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV12@ID@Z */
+/* ?append@?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV12@_KD@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_char_append_len_ch, 12)
+basic_string_char* __thiscall MSVCP_basic_string_char_append_len_ch(
+        basic_string_char *this, size_t count, char ch)
+{
+    TRACE("%p %lu %c\n", this, (unsigned long)count, ch);
+
+    if(MSVCP_basic_string_char_npos-this->size <= count)
+        MSVCP__String_base_Xlen();
+
+    if(basic_string_char_grow(this, this->size+count, FALSE)) {
+        MSVCP_char_traits_char_assignn(basic_string_char_ptr(this)+this->size, count, ch);
+        basic_string_char_eos(this, this->size+count);
+    }
+
+    return this;
+}
+
+/* ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAEAAV01@D@Z */
+/* ??Y?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAAAEAV01@D@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_char_append_ch, 8)
+basic_string_char* __thiscall MSVCP_basic_string_char_append_ch(
+        basic_string_char *this, char ch)
+{
+    return MSVCP_basic_string_char_append_len_ch(this, 1, ch);
+}
+
 /* ??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@ABV10@PBD@Z */
 /* ??$?HDU?$char_traits@D@std@@V?$allocator@D@1@@std@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@0@AEBV10@PEBD@Z */
 basic_string_char* __cdecl MSVCP_basic_string_char_concatenate_bstr_cstr(basic_string_char *ret,
@@ -1437,6 +1465,34 @@ basic_string_wchar* __thiscall MSVCP_basic_string_wchar_append_cstr(
             MSVCP_char_traits_wchar_length(append));
 }
 
+/* ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV12@I_W@Z */
+/* ?append@?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV12@_K_W@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_wchar_append_len_ch, 12)
+basic_string_wchar* __thiscall MSVCP_basic_string_wchar_append_len_ch(
+        basic_string_wchar *this, size_t count, wchar_t ch)
+{
+    TRACE("%p %lu %c\n", this, (unsigned long)count, ch);
+
+    if(MSVCP_basic_string_wchar_npos-this->size <= count)
+        MSVCP__String_base_Xlen();
+
+    if(basic_string_wchar_grow(this, this->size+count, FALSE)) {
+        MSVCP_char_traits_wchar_assignn(basic_string_wchar_ptr(this)+this->size, count, ch);
+        basic_string_wchar_eos(this, this->size+count);
+    }
+
+    return this;
+}
+
+/* ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAEAAV01@_W@Z */
+/* ??Y?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAAAEAV01@_W@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_wchar_append_ch, 8)
+basic_string_wchar* __thiscall MSVCP_basic_string_wchar_append_ch(
+        basic_string_wchar *this, wchar_t ch)
+{
+    return MSVCP_basic_string_wchar_append_len_ch(this, 1, ch);
+}
+
 /* ??$?H_WU?$char_traits@_W@std@@V?$allocator@_W@1@@std@@YA?AV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@0@ABV10@PB_W@Z */
 /* ??$?H_WU?$char_traits@_W@std@@V?$allocator@_W@1@@std@@YA?AV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@0@AEBV10@PEB_W@Z */
 basic_string_wchar* __cdecl MSVCP_basic_string_wchar_concatenate_bstr_cstr(basic_string_wchar *ret,