HTC Wing / P4350 (Herald)

the wing is a great device 😁 .i would really appreciate any help. i receive voice emails or somthing liek that to my yahoo email. i know how to set up to show in my wing but when i try hearing them it says i need an mp3. if i log into the internet and go to yahoo my email i can hear them since it logs to media player. but why doesnt it work when it forward to my cell.. ☹️ .. any help will be appreciated thanx 😁