How can I add "rating wmp" tag on a m4a file

[djs45]

Hello.
All is in the title :)
How can I add "rating wmp" tag on a m4a file ?
Many thanks in advance
Sebastien

[phw]

I don't if Windows' media player supports adding or reading rating tags in M4A files, and if it does what tag. You could try rating a file and look at the tags. But it could be that there is no tag for this.