Change file icon image

I recently had to reinstall Windows XP Professional on my laptop. By
default, the media player edition that comes with the system is the 9 series.
I like the 10 series best, so upgrade to that (yes, I do not like 11 or 12).

For some reason, when I updated this time around, the icons of all the files
that use WMP for playback use the 9 series-based icon instead of the 10
series-based icon. Unlike with applications, where you can right-click the
application's icon, go to properties, and then click on "Change Icon," for
these files that make use of an application, no "change icon" button is
available under properties. How do I change the icon associated with these
files so that they use the 10 series-based icon instead of the 9 series one?

Thanks many,
Zakhary