Ok so I want to install a couple of applications that aren't on the market (notably RockPlayerBase and CarHome.) Anyway, I have Astro (the free version) and I have set the phone to allow unknown installations. However when I navigate to the .apk files on the SD card using astro and select 'Open App Manager' all the summaries are blank and if I go to the 'Details' tab it displays the message "Could not open /sdcard/download/CarDock.apk as APK file" It seems to do this with all .apk files I try and install. Any ideas??