Madrid: printing mac documents?

I don't have a printer in my Madrid flat and took my USB stick to a printing facility (kinda like kinkos), but when they tried to open it up, they were unsuccessful because it was in the wrong format. By this, I am guessing this means that their computers cannot read MAC formatted USB sticks?

Their computers cannot read it, for whatever reason, though I know it can be read on non-Mac computers. Does anybody have any idea where I might be able to take this thing and get my documents printed? Who knew it would be so hard....

I don't know the answer, but if it's a kinkos-type of place, can't you just email yourself the documents. Then go to this place, get on-line in one of their computers, and print it... Just an idea, maybe things aren't so simple.

yes, I can do that. Though when I went to this place they didn't have sit down stations. It only had a counter where you can order things prepared. Maybe the library has something?