some roms won't play properly

[Botbuster]

I'm new to this since I changed from project 64 after learning about the exploit but some rom hacks like mario's nightmare won't load properly, some just stay as a black screen after the title like releasio and in this case, just a black screen entirely with audio only.

Also how do i make some ROM hacks keep the save data on the original SM64 rom

[mcbpete]

Currently the only way to play big (>64mb) rom hacks like b3313 (and presumably Mario's Nightmare) is to replace mupen64plus.dll that's in the 'core' subfolder with this hacked one here - https://benedani.xyz/files/mupen/mupen64plus.dll (full details here - https://benedani.xyz/files/mupen/readme.html )