Been a while since I made a post here. Just thought I would put a small update on another tool I made for Path of Radiance and Radiant Dawn. It’s a cmp/pak extractor. First you need to download this Romhacking.net - Utilities - Nintendo DS/GBA Compressors and extract lzss.exe from it.
Then download this Dropbox - Tellius-CMP-PAK.exe - Simplify your life and place both of them into the same folder. Then all you have to do is drag and drop the cmp file that you want to extract. To repack, drag and drop a folder with the cmp files you want to repack (the structure should be the same as it is when extracted).
It should work on any cmp or pak files. Let me know if any issues pop up and I’ll fix them.