Technical question about WMA files

[MrPatience]

So I plugged in my portable music player tonight, a sony walkman. And out of nowhere every WMA
files appears to be a Nokia OVI file in every way, except in 'properties' it will still be listed as WMA. Which wouldn't be a problem, only they seem to be incapable of playing in media players. They work fine on the device, but it's just a hassle, say, if someone were to put some music on there for me which I then wanted to play on my PC, or vice versa.
I'm really more annoyed than anything else. Those stupid pink icons are fucking annoying.
Does anyone know what's happening?

 

[adamtm]

You need to distinguish between file formats and codecs.
A file format is just a container you put code in.

That way a .avi, .mgp, .wma or ovi file can be:

divx, mpg, h263, xvid, raw, wmv/a, cinepack, mp3 etc pp

So something is maybe changing the file-extension but the codec stays the same.