msi: szUserSid must be NULL if context is MSIINSTALLCONTEXT_MACHINE.

dlls/msi/source.c

@@ -667,8 +667,8 @@ UINT WINAPI MsiSourceListAddSourceExW( LPCWSTR szProduct, LPCWSTR szUserSid,
         return ERROR_FUNCTION_FAILED;
     }
 
-    if (szUserSid)
-        FIXME("Unhandled UserSid %s\n",debugstr_w(szUserSid));
+    if (szUserSid && (dwContext & MSIINSTALLCONTEXT_MACHINE))
+        return ERROR_INVALID_PARAMETER;
 
     rc = OpenSourceKey(szProduct, &sourcekey, MSICODE_PRODUCT, dwContext, FALSE);
     if (rc != ERROR_SUCCESS)

dlls/msi/tests/source.c

@@ -659,10 +659,7 @@ static void test_MsiSourceListAddSourceEx(void)
     r = pMsiSourceListAddSourceExA(prodcode, usersid,
                                   MSIINSTALLCONTEXT_MACHINE,
                                   MSICODE_PRODUCT | MSISOURCETYPE_URL, "C:\\source", 0);
-    todo_wine
-    {
-        ok(r == ERROR_INVALID_PARAMETER, "Expected ERROR_INVALID_PARAMETER, got %d\n", r);
-    }
+    ok(r == ERROR_INVALID_PARAMETER, "Expected ERROR_INVALID_PARAMETER, got %d\n", r);
 
     r = pMsiSourceListAddSourceExA(prodcode, NULL,
                                   MSIINSTALLCONTEXT_MACHINE,