if an image extension is uppercase, LB says it's an invalid file format

[AndromedaToast]

I discovered a minor bug: when adding a game cover that I had downloaded myself from the web, the file extension was in all caps (in this case it was .PNG, rather than .png), and LaunchBox told me it was an "invalid file format." When I changed the extension to be all lower case, LB let me add the image.

[Jason Carr]

Ha, wow, good find. I'll fix it for the next release.