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petopeto said:
That's the core API for querying other APIs. It's used for all types of plugins. I could probably make it work without it, but then it wouldn't even be able to save settings between runs, and if it's missing that I'm sure other things would be broken, too...
You're correct, Photo-Paint can't save settings between runs when using other native PS plugins. It's obviously a very partially implemented API they're using.

Still, other plugins I've tried out seem to work fine other than that particular aspect (or at least, I haven't noticed anything wrong in the few I've used). Obviously, it's your call if you want to bother supporting non-Adobe products like mine. Or, if you're interested in opening up the source, I'd be happy to take a look and see if I can fix it myself.