Just downloaded the demo from
Cnet (30MB). Runs fine on Win 7 64, albeit at 800x600
This was kind of the Crysis of it's day in some ways and a fail in others. I liked it but it was a pig to run on my PC at the time, I seem to remember it was hatefully hard in places and one too many bugs made me rage quit before I completed it.
Edit: the joys of old games, forgot to set the rendering from software to hardware:
Much better

Falling to ones death was also quite common although not as common as... running into a carnivorous critter, flapping your arm about a bit, brushing against a tree thus dropping your gun and then getting eaten alive!