What is a .FAS File And How To Open It – Autodesk (Simple Steps)

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While downloading files, you might have downloaded a file with the .fas extension. Perhaps you know what the file is, but you simply don’t know how to open it. Thanks to this easy guide you will be able to find out what .fas file extension is, how to open it and how to work with it.

What is a .FAS file?

The file extension .FAS is from Compiled Fast-Load AutoLISP File.It was developed by Autodesk. The format of this file is binary, and it is a executable file.

What to know

There is currently 1 software that can open the .fas file on 1 platform.

How to open a .FAS file?

In this part of the article we will show you how to open the .FAS file on various operating systems.

How to open a .FAS file on Windows (7, 8, 10)

The .fas file can be opened in 4 steps on Windows.

1. In the first step you need to download the Autodesk AutoCAD 2020 software. You will be using this software in order to open the file. The other software that you can use is Autodesk AutoCAD 2020.

Step 2

Step 2: Locating your .FAS file

2. In the second step you need to locate the downloaded file. If you don’t remember where you have downloaded your file to, you should check your /download/ folder as it usually gets automatically saved there.

Step 3

Step 3: Choose “Open with”

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Choose the software and click ok

4. After choosing the “Open with” option, you will have an option to choose the Autodesk AutoCAD 2020 software you have downloaded. Choose your software and click on “OK”. That’s all, now you have opened your file on Windows.

Still cannot open the .FAS file?

If you cannot open the .FAS file, it is entirely possible that you are trying to open the wrong file. The .FAS file extension is similar to other file extensions such as: .fas – BroadVision. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.


In this article you have learned how to open the .FAS file with the Autodesk AutoCAD 2020 program on Windows.