Delet - ты ничего не напутал?
http://www.tenebrae2.com/newssystem/tb2_faq.php#an2
Q: What's the target system for Tenebrae2
A: It should run at 30fps on a Geforce4TI with a 1.5ghz processor and
256 megs of ram.
Q: Will Tenebrae2 support both Quake1 and Quake3 bsp format
A: No, Tenebrae2 only supports the Quake3 bsp format. If you want to make new levels in the Quake1 bsp format or
use existing Quake1 levels you should use Tenebrae1.