The compiled LISP is ; it is bytecode for a virtual machine (the Visual LISP interpreter inside AutoCAD). This bytecode is closer to assembly than to source LISP.
The cat-and-mouse game between code protection and decompilation is very active in the AutoCAD community. Several protection tools exist that specifically target VLX and FAS files to make them resistant to decompilation efforts. vlx decompiler
Because the original compiler removes non-essential information, you should not expect a perfect, one-to-one copy of your original code. The compiled LISP is ; it is bytecode
Many decompilers cannot handle the VLX wrapper itself. You must first split it: Use a tool like VLX_Extractor.exe MyAwesomeTool.vlx Output: PROJECT1.fas , UTILS.fas , DIALOGUES.fas The compiled LISP is