Excel 2007 : Setting MP3 track times as 1:23 etc

[nibkwil]

Hi...I'd really appreciate help with the following.
I'm no XL expert and to be honest, I tend to use Excel (I'm on Office 2007) most of the time for generating lists of MP3's or music tracks containing among other things the time-length of each track.
I have one very long XL list of these!
Here's the problem:
I simply want my track times to show in the number format: 'X:YX' eg 4:50 - four minutes, fifty
However, my lists show ZERO + X:YZ
Taking the above example, that would show as: 04:50

For my own reasons, I'd prefer 4:50 but going into 'Custom' I just can't find this format.
Nearest is mm:ss which seems to be default for the above.

Trying to change each one by 'clearing contents' then typing in the desired format doesn't 'take'. Just reverts to the original in a second!

Since I've lot of MP3's/music tracks in the list with the 'wrong format', changing them one by one is just a pain and well..see above for result!

Surely there's some way I can 'Find/Replace' all the track times to the format I want?
Any help or suggestions would be welcome.

Many thanks

[FDibbins]

In custom formatting, you can create your own format. Create 1 that is for m:ss