Since ZWCAD 2017, we do not support to load fas and vlx directly, instead, you need to compile your lisp routine as zelx and vls.
If you have fas and vlx files, you can check the following post from our forum.
https://www.zwsoft.com/zwcad_forum/viewthread.php?tid=4836&highlight=fas
You may find that we can also load zel file, which is to compatible with the encrypted lisp file from old versions such as ZWCAD 2015 or previous versions.
