I am having a problem with .WAV attachments being corrupted when downloaded from Thunderbird. As far as I can tell, this is the only filetype that is being corrupted. Also, as far as I can tell, this is happening to all my emails with a .WAV attachment, both new emails and old emails. I am using Thunderbird 52.1.0. My email account is from Google gmail. A little background, when our Cisco phone system gets a voice message, it creates a .WAV file and emails it to us. In Thunderbird, if I go one of these emails, and double chick on the .WAV attachment, Thunderbird offers me Open with, and with that, Windows Media Player. If I then click on OK, WMP opens, but then gives me an error msg that it can't play the file. In Thunderbird, I instead select Save File, save it on my Desktop, and then double click on the file, WMP opens, but then gives me the same error msg that it can't play the file. If I go to Google gmail webpage, select this same email, download the .WAV attachment to my Desktop, then double click on the file, WMP opens and successfully plays the file. Why the difference? The "bad" file downloaded thru Thunderbird, is 231KB and if I go into Properties ... Details, has no Bit Rate. The "good" file downloaded thru Google's gmail website, is 169KB and if I go into Properties... Details, has a Bit Rate of 64kbps. Again, why the difference? It should be the exact same file! And, how can this please be fixed?