Decal works with win2k, it just cannot co-exsist with the Charstats Filter enabled on win2k with Decal Alpha 3. Charstats and decal alpha 4 are supposed to work together, but some plug-ins do not work with Decal Alpha 4 (one specifically is El Tank, tho I've used it for the first time with alpha 3 and it works nicely).
There have been issues and changes to the HUD interface, and there *WILL* be more changes with the further alpha's, it works but it a kludge,hack thing put together with baling wire and duct tape.
I am amazed that it works as well as it does and as soon as it has given the magnatude and types of changes they have said have been and will be needed.
If you want the details and 'Official' word on decal go here
http://forums.acdev.org/phpBB2/
Personally I guessing that there will be at least more alpha releases at a minimium, but that's *PURE* speculation and guess work on my part.
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http://vnboards.ign.com/message.asp?topic=90389010
/a Devil's Saint says, "what we teach our Children we become" June 3, 2008