04-06-2015, 05:19 AM
The .txp files are LZ11 compressed CTPKs. They can be decompressed using lzx.exe from here (or DSDecmp apparently, but I seem to have issues with that), and converted to PNG using CTPK Tool.
(Figured most of that out from this thread btw.)
(Figured most of that out from this thread btw.)