If you consider to use 2byte characters, such as Chinese, Japanese, etc, for tags, you'll need to use
MPCencT.
1.Put mpcenct.exe into the same folder as mppenc.exe
2.Check 'Use external program for compression'
3.Change 'Parameter passing scheme' to 'User Defined Encoder
4.Set file extension to .mpc
5.Click 'Browse' and locate 'mpcenct.exe'
6.Change 'Additional command line options' to
--quality 5 --xlevel %s %d --tags2 "Artist=%a" "Title=%t" "Album=%g" "Year=%y" "Track=%n" "Genre=%m"7.Check 'Delete WAV after compression'
8.Uncheck 'Add ID3 tag'
Above is based on Case's excellent guide.