Those are SPC files, and that particular example was one rip of Final Fantasy VI (III)'s soundtrack.
Unfortunately, it only handles music embedded in Super Famicom/Super Nintendo games. To convert your own music to SPC, you’d have to rewrite it for the SNES sound chip.
Also, it might be worth noting that Strawberry does support SPC AND VGM files since 2022.
Why don’t they advertise these things? Can they be bothered to list all the formats they support somewhere?
The even more efficient example was Mega Man 3. The standard rip format for NES music is far more efficient but also far more complex, requiring specialized skills to rip instead of a copy of ZSNES and a fast finger on the F1 button.
Edit: the standard rip format for NES music is NSF, but an expanded version NSFe is better if you can get it because it supports metadata like song names and lengths.
