Your command looks good to me. ExifTool should not give an error like this, so I will have to track this down. What version are you using? Try the command with a single image in the current directory. I'm thinking there may be something odd about the names of the files in the directory. Anything you can do to narrow this down will help. Maybe try forward slashes instead of backslashes. I will look into this after I get back from vacation in a week. - Phil