Vonage sends my vm messages to my e-mail on a .wav file so that I can hear them without dialing my vonage phone.
Since ~about the time that 2.2 was pushed to the phone, the .wav 'can;t be read by this device' when I try to open them from my gmail on the htc incred
The same .wav will work from a computer
If I google search for other .wav on the htc incred then it will play those.
Any suggestions, why the phone plays .wav files except when they come through on the gmail?
Thank you.

Access Gmail from your browser

I don't know why the Google Mobile app won't let you access these types of files, but it won't. I know it's a pain, but you must access it through your browser.

After accessing your inbox through your browser, go to the bottom of the screen and switch from "Mobile" to "Desktop," then go back up and click on the file. It should play and/or download without any problems.