A weird story about this. This was the original version when the game was known as Virtua Fighter Remix (same as the Saturn/STV), it was bundled with the Diamond Edge 3D graphics card. This graphics card used quads, just like the Saturn and made sense for Sega to port the game. Problem was that the graphics card flopped and Sega still wanted to support PC gaming especially with DirectX.

Sega then decided to completely redo the port from scratch 8 months later, even the glitched AM2 jingle got fixed. It's still a port of Virtua Fighter Remix with some updates but technically is different (the ground .BMP textures were dropped for the update but gained higher resolution backgrounds, a few easier to rip things). Only the character textures and the music kept the same. Meaning Remix pretty much doesn't work without that graphics card while PC is still somewhat working if broken over time.

Funnily enough, the backgrounds were originally upside down!