Yeah, once it runs through the files once, it won't change them again (it sets the imdb number to 1 to mark it as having gone through it if you accept the db change). To have it go through the files again you'd have to change the imdb numbers back to 0 (through the database directly or by resetting the metadata in video manager). I had good luck with most of my files. I suppose the code could be altered to work on whatever file format. I chose to bulk rename the files that didn't work for me to a format that did work well using the rename utility.