I know it's a strange question, one which I suspect not many of you have asked.
There is a way to answer this question though 
Download the free Audacity audio editor.
From the File menu select Import>Raw Data:
Choose a file:
Select 'U-Law' as the Encoding:
Your setting should look like this:
Channels may be mono or stereo - doesn't really matter much. Finally click on Import and have a listen to your file. This will work with pretty much anything you throw at it - .wid, .exe, .unv, etc. For instance, here is the waveform for the E-Fashion universe:
Sadly .mp3 and .wav attachments are not allowed here, so you'll have to try for yourselves 
. The results are rarely musical but are nonetheless often quite interesting.