Today Microsoft released a patch for the Windows Meta File (WMF) format, which has recently been exploited by criminal hackers. The patches contained within address flaws within Windows 2000, XP, and Windows Server 2003. Windows versions 98, 98 SE, and Me are also vulnerable to attack. However, the software giant issues patches for those systems only if the threat is considered critical. Microsoft does not feel the threat against those systems is critical.