How to change formatting of track number in file name

How can I change the format of track numbers when converting tag information to the file name? The problem I have is when the track number in the tag is formatted like 1/13, mp3tag will convert it to 113 in the file name. I would like the track number in the file name to appear as only 01 (2 digit track number only).

Thanks in advance for you help.

Just use $num(%track%,2)