FileTyper

FileTyper is a very popular, small "drop box" program that you can use to quickly change types, creators, attribute flags and date stamps. It includes many powerful features such as batches, filtering, and directory searches.

If you manually change the creator and the file types frequently, this utility is definitely for you, just drag a file into a "drop box" and it will change any file attribute you want, in less than 1 second!