MediaMonkey 3 includes the in_wmp3 plugin, while MediaMonkey 2.x included as 

in_dsmp3.dll . Both of these rely on Windows' MP3 decoding abilities to decode 

MP3 files. There are no known bugs with these plug-ins though there have been 

occasional reports of partially damaged tracks (e.g. bad CRC's) not playing.



Should playback of MP3s fail with the default plugin, there are two other excellent alternatives:

 1. in_mad.dll. 

    This plug-in was included in much older versions of MediaMonkey, but is

    no longer included due to MP3 and other licensing restrictions. It is

    also considered to be an excellent plug-in especially if you have an

    audio card capable of 24-bit+ audio resolution, but development of this

    plug-in is no longer active. It can also be obtained via the MediaMonkey

    Input Plug-ins page: 

    http://www.mediamonkey.com/addons/browse/item/mad-input-plugin/

 2. in_mpg123.dll. 

     This plug-in was included in previous versions of MediaMonkey,

     but is no longer included due to MP3 licensing restrictions. It is considered to

     be a high-quality plug-in, and streaming incompatibilities with MediaMonkey 

     have been resolved, however, it is no longer actively developed.

     It can be found at: http://otachan.com/in_!mpg123.html

 3. Some Versions of Windows come without Windows Media Player and valid

    Codecs installed (e.g. Windows Tiny). There is small Tutorial how to Fix 

    Windows Codecs:

    http://www.looprecorder.de/tut_l3codec.php

    Windows Media Player version can be seen if you Right Click On

    Windows Media Player window Title -> Help -> About Windows Media Player 

    or using menu help -> About Windows Media Player).

    Try to reinstall WMP or install newer from here:

    http://www.microsoft.com/windows/windowsmedia/download/AllDownloads.aspx?displang=en&qstechnology=



If you replace the default MP3 Input-Plug-ins with either of the above, make 

certain to remove or disable the current plug-ins (e.g. change in_wmp3.dll to 

in_wmp3.dll.off).



Another common problem is that mp2 files are incorrectly assigned an mp3 extension.

For these files, you should change the extension to mp2 and install the mp2 codec:

http://www.mediamonkey.com/addons/browse/item/mp2/



Note: if you wish to verify whether an MP3 is damaged, the following tool is helpful.

It can even fix many common problems with an MP3.

http://www.gromkov.com/faq/repair/mp3_validator.html