FAS File

What are FAS files and how to open them

Are you having problems opening a FAS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your FAS files.

What is a FAS file?

A .FAS file is an AutoCAD Fast-load AutoLISP (FAS4) file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open FAS files

Important: Different programs may use files with the FAS file extension for different purposes, so unless you are sure which format your FAS file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different FAS openers which you will find listed below.

Last updated: April 25, 2024

Various apps that use files with this extension

These apps are known to open certain types of FAS files. Remember, different programs may use FAS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about FAS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.