I should have been more clear when I suggested the WinCE Cab Manager.
GaMedic,
As you already know, the program is far from free. $99 is ridiculous, i know. However, for the limited number of uses we have for this product and considering that you probably will only use this program a couple of times, I did want to let you know that if you go to the OCP Software website and download the WCM you can use it 20 times for free as a trial (i.e. the program can be opened/closed 20 times before it expires).
Here is the link:
http://www.ocpsoftware.com/download.php?nm=cecabmgr
Also, to answer your question about the ringtone format, WM6 supports WAV, WMA, and MP3.
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