.sav, .mpk, .sra, why so many?

[Sowden]

You know, I was thinking, why must there be so many different save states, and memory packs file names? Why can't we all agree on one unaversal file? Or at least, make some program that can convert one to the other, like they are doing at the Playstation emulation secen?

[N-Rage]

there that many cause a N64 has more than 1 Save-Format and they arent compatible since each Rom looks for his specific Save-Format. They arent different cause the Emulator, they are differnt on the real N64.
On a PSX u only have MemPaks hence only 1 Save-Format.