Hey there guys, im planning on doing some hex editing on the WWF No Mercy N64 rom. However i dont know how to decompress the rom, are there any programs that do this?
Here are some freeware programs for most of the common compression formats. Bare in mind that if the file extension on your ROM isn't .zip, .rar or .7z (or some other compressed file extension) and the size of your ROM in bytes is a power of two, it is probably already a decompressed file.
EDIT: Note that not all decompressed ROMs are always a power of two in size, but most are.