I'm currently on the look for the Beatnik/RMF music player that was
apparently released with the japanese version of the original iPaq.. Another
slightly shady arab website from the 2000s mentions that
version 1.1 supported Windows CE 2.11 minimum which means that this program not only supports the iPaq and other Pocket PCs from the time, but also several devices covered and very much talked about in HPCFactor. I just found an archived CD of Pocket PC software where this program is mentioned. I'll try extracting it and hopefully someone could test it on an ARM HPC running CE 2.11 or higher.