The WV2 extension indicates a Sonarc compressed WAV file.
?Why use WV2 files?  Please see the bottom of this page.

SONARCX.EXE (size=25K) is used to expand WV2s to WAVs.  It's VERY
easy to use. It doesn't write to the registry, or install in any way.
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THE FOLLOWING IS ALL YOU NEED FOR WV2s:
To expand ALL WV2s to WAVs, without having to type an MSDOS command:
use WV2WAV.EXE (size=2K).  Just click on it.
(You also need SONARCX.EXE, and at least one WV2, for this to work.)
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ALL OF WHAT FOLLOWS IS OPTIONAL, NOT REQUIRED:
To expand a single WV2 to a WAV, without having to type an MSDOS command: 
use the small EXE (size=2K) with the same name as the WV2 you want to play.
Just click on it. (You also need SONARCX.EXE, & the WV2, for this to work.)
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How to use SONARCX.EXE with manual command line entry:
1st make sure SONARCX.EXE and the WV2 file are together
2nd at the MSDOS prompt; type "sonarcx *.wv2"
                  (Or, instead or the "*",
                             type the name of the WV2 you want to expand.)
    then press the "enter" key.
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SONARCX.EXE comes from SONARC, the lossless audio file archiver.
The URL for the full program (size=70K) is
ftp://ftp.oce.nl/pub/Internet/audio+video/MIDI/PROGRAMS/MSDOS/snrc21.zip
(or follow the Useful Links on the Song Listening Booth Home Page).
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By the way....
In order to get a good idea of what a song REALLY sounds like:
YOU NEED TO HEAR BOTH.... 
the mono Full-Length version.... as well as....
the stereo Near CD Quality excerpt version.                                   
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?Why are you using the WV2 file format?                                     
I use it because.... when using the same 44.1Khz audio source:    
          a mono 8bit 11Khz WAV file.... sounds better to me....
    than a mono MP2 32K-BitRate file....
The 8bit 11Khz WAV file can then be reduced in size by Sonarc, and
the WV2 can then be compared to the size of the 32K-BitRate MP2 file....
Even if the WV2 ends up being slightly larger than the MP2, the
WAV sounds better to me.... so I prefer the WV2 over the 32K-BitRate MP2.
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