With the exception of some Apple formats, which do not allow leading zeros, all my tags have leading zeros for tracks 1-9 (01-09). However, regardless of the file type, my file names always have leading zeros, so whatever OS/Player or other software sees them in the correct order.
I have some compilations that consist of multiple discs, and I typically remove the disc numbers and make them one giant album, as many of the online databases (Amazon, Discogs, etc.) do this.
Because of this, I have a few compilations that contain over 100+ tracks.
So, my question is, how would you format the track numbers for albums that have more than 100 tracks? Would you leave tracks 1-99 as "01-99", or would you add an extra 0, making it "001-099"?