RetroArch doesn't recognize all my roms

[Thwyster]

Good Afternoon Guys. I just started using retroarch, but when i make it search my roms folder it only recognize some of them in the menu of the console

All of the are always in the same formats: smc for SNES, z64 for N64, gba for GBA
Anyone knows what the issue might be?

I see this post in reddit:
https://www.reddit.com/r/emulation/comments/3imlri/i_wrote_a_batch_script_to_add_unsupported_roms_to/

Thanks in advance! :D