I have used Wavepad and I think this is a very good software for any user who wants to use it, but there is one problem that I find in this software and this is..........
THAT IT IS NOT ABLE TO LOAD AND CONVERT .STM EXTENSION files.........
Why is it so.......... 
I would like to hear from you as soon as possile.......... and if possible please do get this option in the updated version of Wavepad coming our way......... 
please.........