Ring Tone Help

[xplod4202]

Ok i hope some one can help me with this, because i have been trying for two days and nothing.

I got a specific .midi sound from treo that i want to use for my threaded sms app. I put it in the windows directory. Then i go to Settings, Sounds, pick a palm sms, and go to notifications and the treo sound is just not there. Is there a specific place that i need to put it in, in order for it to show up, or some reg tweak that needs to be done? Any help would be appreciated.