Afaik only the Gulfwar2 file will work in Open GL (which runs fine on ATI, Matrox, Nvidia, and 3dfx cards). The other files in question are all Glide (3dfx) texture files, so you would, of course need a 3dfx card to be able to use them.
I have heard a rumor that the GeForce 3 has built in Glide support as part of it's nFiniteFX engine, but no one has verified it.
Give it some time. I'm sure some one like Q-bik will start producing texture files in Targa (Open GL) format, for PSF.
[This message has been edited by fubar_512 (edited 10-17-2001).]
[This message has been edited by fubar_512 (edited 10-17-2001).]