This produces "filename.binary". The "-2" says to compile for P2, otherwise it will compile for P1. There are other options, the Fastspin.md file explains them. I guess for the editor the most important is -Lpath for specifying where to find included objects.
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But, maybe I didn't look hard enough..
p2asm does produce filename.bin, so when you use fastspin you will need to load filename.binary instead of filename.bin.