Latest Mover is 1.01, but gives the same file format as version 1.0. I've downloaded the pcf successfully but not having the original frog I can't really do anything useful apart from looking at the header of the pcf which looks OK at first glance. The other possibility that comes to mind for this error is that some other process is using one of the files and won't release it. Do you have Poser running with the seed file at the same time as you're running Mover? Or is the pcf file open in a hex viewer or WordPad? After that I'm running out of ideas.