PowerPak files - unf or nes?

[eebuckeye]

What filetypes work with the PowerPak? I do not see it in the manual or website (I'm probably missing it).

Is unf or nes preferred? Do both work the same?

Thanks!

[ProgrammingAce]

I've only ever used .nes roms

[Gapporin]

.fds files (Famicom Disk System) also work as well.