Hey guys i got interested in compression lately. So going trough your sources i saw that in your decoder you used "LZMA SDK" by Igor Pavlov. I expect you used emscripten or something to turn original C into JS. However I am most interested about your encoder. I looked in 3dmax exporter but no luck. Could you please provide some resources on what did you use to create your encoder. Thank you.
The compression(enconding) is done through the DLL called from MaxScript. See if these links help?