Suddenly can't open .wav and .mp3

I was having this same issue but it looks like it has been fixed in the latest update to Play Music.
 
Similar problem while trying to transfer mp3s to android device via google drive. Went into apps, discovered that Google Play Music app was disabled, enabled app, now able to play tracks.
 
Howdy. I'm suddenly having trouble opening up audio attachments/files. Running a Nexus 4 - OS 4.4.2. I get my work voicemail as e-mail attachments in .wav format. Up until today I was able to just tap on the attachment, and it would download and start playing. Now it says "No app can open this attachment for viewing". If I go into the Downloads and try to open it up, it says, "Can't open file". Same if I try and open up a mp3 that's in Downloads. However, opening a PDF or Excel file from Downloads or straight from email works just fine. If I go into the music player I can open up the .wav and .mp3 files from Downloads just fine.

I tried restarting a few times, and also tried clearing the app cache with no luck. What should I try next?

Thanks in advance.