noob here

I have little experience with roms and emulatorsi have a emulator right now for n64 and i have some roms for it but i downloaded some more and those that i downloaded from that site are not working and it just saysThe file you loaded does not seem to be a valid N64 rom.How do I know which ones are which?

the roms from this site are compressed using WinRAR and need to be extracted before use. Get winrar from www.rarlabs.com