iq_132, does Ultimatezip unzip files that have been compressed using the latest Winrar? I have powerarchiver which can extract .rar files - but the version I have doesn't work properly with anything rar'ed with the latest Winrar.
Rar files are a lot like zip files, they both are compressed archives. Except most emulators can't read games inside of rar files, so you'll have to extract the game from the rar file using winrar, like it was previously stated by trotterwatch. After that, you should have a n64 rom readable by project 64.
yeah we talked about this and decided that .rar would be too slow even if implemented, so zip it is. zip is fast, free and reasonably good compression, so it suits us perfectly.