Sounds like it's trying to use your tmp directory and, failing that, using C: instead. You're fine deleting them, worst thing to happen would be a wabbitemu crash.

I assume they are deleted when closing Wabbitemu, but when WabbitEmu crashes/freezes, they're left over, right?

I assume they are deleted when closing Wabbitemu, but when WabbitEmu crashes/freezes, they're left over, right?

I've had them left over after Wabbit closed (early version, though).

So are they basically Wabbit's prog files?

Haha you guys. I can tell you exactly what they are, they're temporary files wabbit creates when you do certain stuff (drag screenshots, export files, compressed save states, etc). I think I've moved them all to appdata, but maybe not. Blame spencer for not knowing to use getenv when he first coded.
tl;dr delete them and tell me if the latest wabbit mucks with your root dir more