You will see that it relies on the Windows search feature. It searches for all the files called "album.m3u" in your music folder. Windows will then display them all in a list. It then formats the list so the files are displayed in a single column. The script then simply opens each of the files in the list, adds the 00-, saves the file, and moves to the next one. It's important that before running the script you go to folder options and tell Windows that Notepad (rather than Winamp) should open m3u files. That's all there is to it. I have about 1,300 albums and it takes 20 minutes to modify them all.