Update to 2.2.3. From the changelog:

- added ID3v2 support (for known tags like title, artist, album,
    track number, ...)
- added '@nX' to '-o' option to specify the number of digits (X)
    in the output track identifier number
- added '-N' option for Not writing mp3splt.log file
- added the '@N' variable when using the '-g' option for auto
    incrementing the track number in the tags
- created a completely new windows installer allowing to install
    only some components and to uninstall only the installed files
- added some more documentation about the 'off' parameter
- updated to check for illegal characters in output filenames
- fixed bug with mp3splt not searching for plugins in its directory
    on Windows (it will now search in the directory of the 'mp3splt'
    executable if we detect a path from the launch command and in
    the installation directory written in the registry)
- fixed the zeroes not being added before the number when using @n
- fixed small bug about '-Q' not working right
- the default behaviour of the tags on the split files has changed:
    by default, we set the tags version of the file to split in the
    split files (for example if the file for split has ID3 version
    X, the tags in the split files will be ID3vX)
- added -1 (force tags in output files to be ID3v1) and -2 (force
    tags in output files to be ID3v2) options
- implemented query{search_string}(chosen_result_int) for the -c
    option : windows users should use this instead of -c query when
    searching using a "unicode" string
- fixed all tags/filenames "unicode" encoding issues on windows
- fixed small track issue in tags
- fixed issue when the output is the same as the original file

(schmonz)