FAS File Type

- The quick facts

What are FAS files and how to open them

Are you having problems opening a FAS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a FAS file?

A .FAS file is an AutoCAD Fast-load AutoLISP (FAS4) file. Through our analysis of FAS files, we know that one use of the format is AutoCAD Fast-load AutoLISP (FAS4). We have not yet described in detail what these files contain and what they are used for, but our team is working tiredlessly through thousands of file formats. We'd love hearing from you if you have information about the format.

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 10 different FAS openers which you will find listed below.

Last updated: August 12, 2021

Suggest another file format using extension FAS

While we know of one file format using the .FAS file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .FAS file.

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.

BioEditBioEditUser submitted
Molecular Evolutionary Genetics AnalysisMolecular Evolutionary Genetics AnalysisUser submitted
SnapGene ViewerSnapGene ViewerUser submitted
DnaSPDnaSPUser submitted
SnapGeneSnapGeneUser submitted
Unipro UGENEUnipro UGENEUser submitted
fplaunchfplaunchUser submitted
GENETYX Version ApplicationGENETYX Version ApplicationUser submitted
easescreen Crystal Screen-Managereasescreen Crystal Screen-ManagerUser submitted
Wondershare Photo Story PlatinumWondershare Photo Story PlatinumUser submitted
We have not verified any software that we know for certain will work with FAS-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with FAS-files. If you know one, please use the 'Suggest a program' link below and tell us about it!