diff --git a/dlls/shlwapi/ordinal.c b/dlls/shlwapi/ordinal.c
index 810b5746b4a..4118d4b3083 100644
--- a/dlls/shlwapi/ordinal.c
+++ b/dlls/shlwapi/ordinal.c
@@ -3805,137 +3805,6 @@ HRESULT WINAPI CLSIDFromStringWrap(LPCWSTR idstr, CLSID *id)
     return CLSIDFromString((LPCOLESTR)idstr, id);
 }
 
-/*************************************************************************
- *      @	[SHLWAPI.437]
- *
- * Determine if the OS supports a given feature.
- *
- * PARAMS
- *  dwFeature [I] Feature requested (undocumented)
- *
- * RETURNS
- *  TRUE  If the feature is available.
- *  FALSE If the feature is not available.
- */
-BOOL WINAPI IsOS(DWORD feature)
-{
-    OSVERSIONINFOA osvi;
-    DWORD platform, majorv, minorv;
-
-    osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOA);
-    if(!GetVersionExA(&osvi))  {
-        ERR("GetVersionEx failed\n");
-        return FALSE;
-    }
-
-    majorv = osvi.dwMajorVersion;
-    minorv = osvi.dwMinorVersion;
-    platform = osvi.dwPlatformId;
-
-#define ISOS_RETURN(x) \
-    TRACE("(0x%x) ret=%d\n",feature,(x)); \
-    return (x);
-
-    switch(feature)  {
-    case OS_WIN32SORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32s
-                 || platform == VER_PLATFORM_WIN32_WINDOWS)
-    case OS_NT:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_WIN95ORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS)
-    case OS_NT4ORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 4)
-    case OS_WIN2000ORGREATER_ALT:
-    case OS_WIN2000ORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5)
-    case OS_WIN98ORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS && minorv >= 10)
-    case OS_WIN98_GOLD:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS && minorv == 10)
-    case OS_WIN2000PRO:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5)
-    case OS_WIN2000SERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && (minorv == 0 || minorv == 1))
-    case OS_WIN2000ADVSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && (minorv == 0 || minorv == 1))
-    case OS_WIN2000DATACENTER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && (minorv == 0 || minorv == 1))
-    case OS_WIN2000TERMINAL:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && (minorv == 0 || minorv == 1))
-    case OS_EMBEDDED:
-        FIXME("(OS_EMBEDDED) What should we return here?\n");
-        return FALSE;
-    case OS_TERMINALCLIENT:
-        FIXME("(OS_TERMINALCLIENT) What should we return here?\n");
-        return FALSE;
-    case OS_TERMINALREMOTEADMIN:
-        FIXME("(OS_TERMINALREMOTEADMIN) What should we return here?\n");
-        return FALSE;
-    case OS_WIN95_GOLD:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS && minorv == 0)
-    case OS_MEORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_WINDOWS && minorv >= 90)
-    case OS_XPORGREATER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5 && minorv >= 1)
-    case OS_HOME:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5 && minorv >= 1)
-    case OS_PROFESSIONAL:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_DATACENTER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_ADVSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 5)
-    case OS_SERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_TERMINALSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_PERSONALTERMINALSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && minorv >= 1 && majorv >= 5)
-    case OS_FASTUSERSWITCHING:
-        FIXME("(OS_FASTUSERSWITCHING) What should we return here?\n");
-        return TRUE;
-    case OS_WELCOMELOGONUI:
-        FIXME("(OS_WELCOMELOGONUI) What should we return here?\n");
-        return FALSE;
-    case OS_DOMAINMEMBER:
-        FIXME("(OS_DOMAINMEMBER) What should we return here?\n");
-        return TRUE;
-    case OS_ANYSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_WOW6432:
-        {
-            BOOL is_wow64;
-            IsWow64Process(GetCurrentProcess(), &is_wow64);
-            return is_wow64;
-        }
-    case OS_WEBSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_SMALLBUSINESSSERVER:
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT)
-    case OS_TABLETPC:
-        FIXME("(OS_TABLETPC) What should we return here?\n");
-        return FALSE;
-    case OS_SERVERADMINUI:
-        FIXME("(OS_SERVERADMINUI) What should we return here?\n");
-        return FALSE;
-    case OS_MEDIACENTER:
-        FIXME("(OS_MEDIACENTER) What should we return here?\n");
-        return FALSE;
-    case OS_APPLIANCE:
-        FIXME("(OS_APPLIANCE) What should we return here?\n");
-        return FALSE;
-    case 0x25: /*OS_VISTAORGREATER*/
-        ISOS_RETURN(platform == VER_PLATFORM_WIN32_NT && majorv >= 6)
-    }
-
-#undef ISOS_RETURN
-
-    WARN("(0x%x) unknown parameter\n",feature);
-
-    return FALSE;
-}
-
 /*************************************************************************
  * @  [SHLWAPI.439]
  */
diff --git a/dlls/shlwapi/shlwapi.spec b/dlls/shlwapi/shlwapi.spec
index 55655a627c4..060daccf246 100644
--- a/dlls/shlwapi/shlwapi.spec
+++ b/dlls/shlwapi/shlwapi.spec
@@ -434,7 +434,7 @@
 434 stdcall -noname SendMessageTimeoutWrapW(long long long long long long ptr) user32.SendMessageTimeoutW
 435 stdcall -noname CLSIDFromProgIDWrap(wstr ptr) ole32.CLSIDFromProgID
 436 stdcall -noname CLSIDFromStringWrap(wstr ptr)
-437 stdcall -ordinal IsOS(long)
+437 stdcall -ordinal IsOS(long) shcore.IsOS
 438 stub -noname SHLoadRegUIStringA
 439 stdcall -noname SHLoadRegUIStringW(ptr wstr ptr long)
 440 stdcall -noname SHGetWebFolderFilePathA(str ptr long)