So I decided to take a look into modding this game and its sequel, not sure if anyone else has extensively researched it yet, but I've made some progress so far. You can use this to unpack the Target.bin container, which holds the majority of the games assets. Most of the assets are stored as CMP, which are compressed with LZ77 and can be decompressed easily with DSDecmp or any other method of your choice. At this point though, I'm a little stuck when it comes to the textures. The textures when decompressed result in a file with a DMPBM header. Looking through the file listing, I see some already uncompressed files with the extension DBM, which shares the same header. DBM (or DMPBM if you prefer) definitely contain textures, but as of current I am having trouble deciphering them. If anyone else has some insight on it, I'd be interested to hear their findings. Below I've included a RAR containing a CMP and its decompressed DBM (DMPBM) - it should be the texture for the main character's portrait if my hunch is correct.