Problems with XML file paths that include spaces?

Hi, I made a Flash Projector that takes images and makes them into a kind of photo gallery, but my images aren’t showing up. They were showing up before when I had them in the same folder as the XML so I didn’t need the whole file path. Is it bad to refer to an XML file path that includes spaces, and is it bad for the XML file itself to refer to images with file paths that include spaces?

Also, i saw something that said “Flash doesn’t display progressive jpg’s” and that the .jpg part is case sensistive. Is this true, and what does Progressive jpg mean? Pictures of women working as mechanical engineers? Hahaha.

Thanks for your help,
a grad student having a lot of fun on a Friday night