XeNTaX

All game data is stored in fil archives.
I uploaded some of the sfx ones here: http://uploaded.de/?id=k1p5hw
The first byte in the file seems to indicate which data it holds.
A demo can be downloaded here: http://downloads.gamezone.com/demos/d1749.htm

Any help is appreciated.

Edit: Uploaded the rest here: http://uploaded.de/?id=3l189s

Extractor attached.

Information on the encryption can be found at my site (see sig).