It must be an old file that has had stuff deleted from it, yes? I just created a new file (Creo 4.0, M090) with no template (empty) and its size is 34Kb. I think there's a lot of "baggage" and other remnants of stuff left in a file even after all the features have been deleted. I don't know what kind of persistent junk is retained in the part database, but I wish there were a way to purge it.
