3DFX mode doesn't work on Windows

[Kappa971]

On Windows 11 it doesn't work, it shows two full screen windows with a white box in the center and only the audio works:

The normal version works, although there is a lot of stuttering with a 144 Hz FreeSync monitor:

Probably the game engine has problems running at fps higher than 60, but there is no fps limiter implemented in game, and external limiters don't work as they should in this port, so currently this source port on high refresh rate displays works very poorly (software rendering, I can't test the OpenGL one, as already specified).

This is the Italian version with the blood patch. There is also a small compatibility problem with this version: https://github.com/dethrace-labs/dethrace/issues/435

OS: Windows 11 CPU: R7 5700X GPU: RX 6700 XT