Quote:

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...in a practical sense, only Windows XP and Windows Server 2003 (in all their service pack levels) are vulnerable to the WMF flaw.
...all versions of Windows back to 3.0 have the vulnerability in GDI32. Except for Windows XP and Windows Server 2003, no Windows versions, in their default configuration, have a default association for WMF files, and none of their Paint programs or any other standard programs installed with them can read WMF files...

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from http://www.f-secure.com/weblog/

it sure seems that I don't need to worry at all, after all, I don't have a single XP system at home