Use the newest version (v0.4 beta) to get the DLC that distributed along with a design/pattern (e.g. Kintaro wig from JP region). The older version cannot extract it. The design/pattern is still not extracted at this point of time until I have a chance to learn more about the distributed format (so far it looks like BITM/ASH0 combination which contains the brres file as well).

Here are the pictures (Kintaro wig, $AED0 and school cap, $AD98):