How to play AMR files?

First of all, get the QuickTime Player; yep, nobody loves it, but we can't play the files without their wonderful codecs.

Then, in order to Play the AMR files using Winamp:

Download and install MediaLooks QuickTime DirectShow Source Filter.

It is a DirectShow filter, so, after installation, run:
 

C:\Winamp\Options\Preferences\Plug-ins\Input\

And double-click the Nullsoft DirectShow Decoder in order to pull up it's settings dialog.
 

Click on Configure button and add ;AMR to the extension list.

Play the files using Windows Media Player

Download and install River Past QuickTime DirectShow Filter for WMP.