If you are looking for the decompiler itself, visit https://github.com/jindrapetrik/jpexs-decompiler
List of issues
: The issue tracker is now writable again and logged users can download files too. But note that our support is very LIMITED.
#66 Decompress LZMA from commandline
From guestbook by Swede: Decompress LZMA from commandline
version 1.5.0 was released. -decompress option now decompresses LZMA compressed files too.