There is an updated Widescreen Fix with 3DFX Glide support available here: http://www.zeus-software.com/forum/viewtopic.php?f=10&t=859&p=5067&hilit=undying#p5067
For some reason I am unable to upload files or post on the forum from my account, the PCGW site tells me that I'm not logged in on those pages.
I've left the widescreen section alone for now, as I'm not sure what your policy is on linking to external patches vs hosting them on the site. (which I would prefer to do)