Why so serious? By me remake is so much better even in terms of code (that awful Macromedia Director in old version, bleeeeh). And no, I am not working on it, I just wondering about images Anyway, if you started that - you have a tool to extract files from cst archives (Macromedia Director protected files)? Did not found any working urls for such a thing...
Actually it is just 100% standard LZSS from 1989 by Haruhiko Okumura - https://oku.edu.mie-u.ac.jp/~okumura/compression/lzss.c
You can just compile the script by my link (do not forget to change 0x20 in buffer to be 0x0) and this would do perfect compress/decompress.