When in doubt, leave it out. Have you seen this or other malformed KB filenames? Contact our security team.
A suspicious filename – Windows6.1-kb958-488-v6001-x64.msu – has been observed in unofficial download sites, forums, and outdated driver bundles.
It's important to clarify upfront: with that exact string.
Let’s break down what this should be, what it actually is, and the risks involved. If you remove the stray hyphen ( 958-488 → 958488 ) and the odd v6001 segment, you land on KB958488 – a real Microsoft update from October 2008 / early 2009.