mlang/tests: Fix a test failure on Win2k.
diff --git a/dlls/mlang/tests/mlang.c b/dlls/mlang/tests/mlang.c
index e29da39..11e26db 100644
--- a/dlls/mlang/tests/mlang.c
+++ b/dlls/mlang/tests/mlang.c
@@ -1946,7 +1946,8 @@
          * up an installation dialog on some platforms, even when specifying CPIOD_PEEK.
          */
         if (IsValidCodePage(i))
-            ok(hr == S_OK, "code page %u is valid but not installable 0x%08x\n", i, hr);
+            ok(hr == S_OK || broken(hr == E_INVALIDARG),  /* win2k */
+               "code page %u is valid but not installable 0x%08x\n", i, hr);
     }
 }