ShortBrained

Hello, I'm trying to figure out what tools I need to decrypt scripts in the SDT file format, and have had no luck finding any sort of helpful information. The game runs on the xlvns engine (Leaf/Aquaplus), and despite the numerous projects that involved said engine, I can't seem to find any tools (probably because those projects are over a decade old), outside of what was used to actually gain the encrypted files, which I can't really do anything with. If someone could link me some tools. or point me in a helpful direction I'd really appreciate it.