PNGs have been a standard file format for so long, I find it strange that software still has issues with them. I'm not a windows guy, so I don't have issues with them.
They're relatively compact, support transparency, and non-lossy compression -- so they're cool. But, oh well.
I didn't post this at Deviant Art, but that's fine. If someone else did, yes, please post a link. I'd like to know who did.