Developing for iPad/iPhone – Add iTunes artwork for ad hoc distribution
When deploying an application using the ad hoc distribution “style”, the developer has to supply the image shown in the installed applications tab of iTunes. This file has to be a 512 by 512 PNG or JPEG image called iTunesArtwork that has to be extension-less. You have to manually delete the extension and check that the file type is no set to jpg or png for it to work and show up in iTunes, this step is vital and isn’t documented. Without the iTunesArtwork, iTunes will show a generic image for your application.
To check and change file type i used “FileType” freeware software