diff --git a/dlls/msvcp80/msvcp80.spec b/dlls/msvcp80/msvcp80.spec
index 3cadb5f74ef..23576f5a085 100644
--- a/dlls/msvcp80/msvcp80.spec
+++ b/dlls/msvcp80/msvcp80.spec
@@ -740,8 +740,8 @@
 @ stub -arch=win64 ??0?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@IEAA@XZ
 @ thiscall -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z(ptr ptr) msvcp90.??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z
 @ cdecl -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@@Z(ptr ptr) msvcp90.??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@@Z
-@ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z
-@ stub -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z
+@ thiscall -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z(ptr ptr long long) msvcp90.??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z
+@ cdecl -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z(ptr ptr long long) msvcp90.??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z
 @ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@IIABV?$allocator@D@1@@Z
 @ stub -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1AEBV?$allocator@D@1@@Z
 @ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV?$allocator@D@1@@Z
@@ -792,8 +792,8 @@
 @ stub -arch=win64 ??0?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QEAA@_KGAEBV?$allocator@G@1@@Z
 @ thiscall -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@@Z(ptr ptr) msvcp90.??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@@Z
 @ cdecl -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@@Z(ptr ptr) msvcp90.??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@@Z
-@ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z
-@ stub -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z
+@ thiscall -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z(ptr ptr long long) msvcp90.??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z
+@ cdecl -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z(ptr ptr long long) msvcp90.??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z
 @ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@IIABV?$allocator@_W@1@@Z
 @ stub -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1AEBV?$allocator@_W@1@@Z
 @ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV?$allocator@_W@1@@Z
diff --git a/dlls/msvcp90/msvcp90.spec b/dlls/msvcp90/msvcp90.spec
index f41cf793587..41622344974 100644
--- a/dlls/msvcp90/msvcp90.spec
+++ b/dlls/msvcp90/msvcp90.spec
@@ -734,8 +734,8 @@
 @ stub -arch=win64 ??0?$basic_streambuf@_WU?$char_traits@_W@std@@@std@@IEAA@XZ
 @ thiscall -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@@Z(ptr ptr) MSVCP_basic_string_char_copy_ctor
 @ cdecl -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@@Z(ptr ptr) MSVCP_basic_string_char_copy_ctor
-@ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z
-@ stub -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z
+@ thiscall -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z(ptr ptr long long) MSVCP_basic_string_char_ctor_substr
+@ cdecl -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z(ptr ptr long long) MSVCP_basic_string_char_ctor_substr
 @ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@IIABV?$allocator@D@1@@Z
 @ stub -arch=win64 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1AEBV?$allocator@D@1@@Z
 @ stub -arch=win32 ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV?$allocator@D@1@@Z
@@ -786,8 +786,8 @@
 @ stub -arch=win64 ??0?$basic_string@GU?$char_traits@G@std@@V?$allocator@G@2@@std@@QEAA@_KGAEBV?$allocator@G@1@@Z
 @ thiscall -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@@Z(ptr ptr) MSVCP_basic_string_wchar_copy_ctor
 @ cdecl -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@@Z(ptr ptr) MSVCP_basic_string_wchar_copy_ctor
-@ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z
-@ stub -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z
+@ thiscall -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z(ptr ptr long long) MSVCP_basic_string_wchar_ctor_substr
+@ cdecl -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z(ptr ptr long long) MSVCP_basic_string_wchar_ctor_substr
 @ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@IIABV?$allocator@_W@1@@Z
 @ stub -arch=win64 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1AEBV?$allocator@_W@1@@Z
 @ stub -arch=win32 ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV?$allocator@_W@1@@Z
diff --git a/dlls/msvcp90/string.c b/dlls/msvcp90/string.c
index db9022f8517..38e6366a0fe 100644
--- a/dlls/msvcp90/string.c
+++ b/dlls/msvcp90/string.c
@@ -737,6 +737,20 @@ basic_string_char* __thiscall MSVCP_basic_string_char_ctor_cstr(
     return this;
 }
 
+/* ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@ABV01@II@Z */
+/* ??0?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@AEBV01@_K1@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_char_ctor_substr, 16)
+basic_string_char* __thiscall MSVCP_basic_string_char_ctor_substr(
+        basic_string_char *this, const basic_string_char *assign,
+        size_t pos, size_t len)
+{
+    TRACE("%p %p %lu %lu\n", this, assign, (unsigned long)pos, (unsigned long)len);
+
+    basic_string_char_tidy(this, FALSE, 0);
+    MSVCP_basic_string_char_assign_substr(this, assign, pos, len);
+    return this;
+}
+
 /* ??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QAE@XZ */
 /* ??1?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@QEAA@XZ */
 DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_char_dtor, 4)
@@ -1029,6 +1043,20 @@ basic_string_wchar* __thiscall MSVCP_basic_string_wchar_ctor_cstr(
     return this;
 }
 
+/* ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@ABV01@II@Z */
+/* ??0?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@AEBV01@_K1@Z */
+DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_wchar_ctor_substr, 16)
+basic_string_wchar* __thiscall MSVCP_basic_string_wchar_ctor_substr(
+        basic_string_wchar *this, const basic_string_wchar *assign,
+        size_t pos, size_t len)
+{
+    TRACE("%p %p %lu %lu\n", this, assign, (unsigned long)pos, (unsigned long)len);
+
+    basic_string_wchar_tidy(this, FALSE, 0);
+    MSVCP_basic_string_wchar_assign_substr(this, assign, pos, len);
+    return this;
+}
+
 /* ??1?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QAE@XZ */
 /* ??1?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@QEAA@XZ */
 DEFINE_THISCALL_WRAPPER(MSVCP_basic_string_wchar_dtor, 4)