Open MP3 Rage and drag the LimeWire doc into the "Display and Edit MP3 File Tags" bar, in the upper right hand corner of the window that will open, you'll see the filename, then two windows labeled Type and Creator.

Change Type to: SITD
and Creator to : SITx

Another post had an ! mark after the Creator and that works for some small files, but for large application files this worked for me. Please post if this works for anyone else.