i had the same problem last week. was transferring music and picodrive files using a mac after getting my n900 back from having the usb problem fixed and pulled out the cable without ejecting the drives. all the folders were .exe and 2?? kb. Can't remember if I used mass storage mode or pc suite and nokia phone viewer on xp but could still save the data, format the phone memory and sd card and re-transfer the data. It worked.