I'm trying to download the SMS app from XDA and the guy has it up as a zip file. I download it and extract it, and it's a folder with random crap in it. No apk. Then I read that I just change the file name. I'm on a Mac, so I change the filename and it verifies if I want to change it from .zip to .apk and I say "yes." Put it on my card and Astro still doesn't recognize it. It's list, but it's an icon with a window and a gear in front of it. I installed the Vanilla email app, no problem. Not sure what the deal is with this one.