Like I mentioned before, it takes a long time to remove tags from the beginning of a file. Of course I do all this via batch processing. With tags at the end, all that needs to be done is truncate the file. This takes a millisecond or two. To copy a 5 meg file and takes a couple orders of magnitude longer! When you're processing thousands of files, even if they all have tags at the end, it can be done in a couple seconds. But expect it to take hours if the tags are at the beginning.