Commodore 64 .prg and .p00 files not showing

I put .prg and .p00 files in the C64 folder but they are not seen by the system and C64 doesn’t show at all like there were no games for it.
It shows with .d64 files in the folder and they work.
I thought every c64 emulator from the last 20+ years supports these formats.

I’ve made a workaround by renaming file.prg and file.p00 as file.d64 and then they show up and work.