PC version Fans have made a PC version. Some are still early, so read the project page first.
Fans took WWF No Mercy Recompilation 2 apart and rebuilt it so it runs natively on a computer, often with widescreen, higher frame rates and mods. Here is the project we know about:
Native PC port of WWF No Mercy (N64) via static recompilation. No game assets included — bring your own ROM.