by Disjuku on Sat Jun 16, 2007 3:21 am
Sounds to me like the file has saved the preview but the atcual file is corrupted... this could be due to things such as the file being interrupted half way through saving, or the file has been corrupted somewhere.
Sometimes you will find that you can open these files in different places and re-save. Try opening/importing it into anything you can think of.
If that doesn't work, then I don't believe there is much you could do - the information simply doesn't exist.