Home : File Types : FAS File (3 File Associations)

.FAS File Extension

File Type 1Compiled Fast-Load AutoLISP File

4.0 (3 Votes)
CategoryExecutable Files


This file is saved in a binary format, which requires a specific program to read its contents.

What is a FAS file?

Compiled script written in AutoLISP, a variation of the LISP programming language used specifically for the extension of AutoCAD software; often used for creating macros that automate common processes within AutoCAD; can be used for distributing utilities that add new features to the software.

More Information

FAS files are commonly compiled using Visual LISP, an IDE that is included with some AutoCAD purchases.

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Programs that open FAS files
Updated 9/26/2011

File Type 2FASTA Sequence File

2.8 (5 Votes)
CategoryData Files


This file is saved in a plain text format. You can open and view the contents of this file using a text editor.

.FAS File Association 2

Plain text file saved in the FASTA format, a file format used for storing DNA sequences; used in the process of storing and processing bioinformatics information, such as the genomes of different species.

Programs that open FAS files
Updated 3/18/2015

File Type 3QuickSilver Fast Save Lisp File

2.5 (2 Votes)
CategoryExecutable Files


File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.

.FAS File Association 3

Compiled Lisp (.LSP) file saved in the "Fast Save Lisp Format" by Interleaf or QuickSilver; contains compiled code that can be executed by the program; may be generated by selecting either the DTK→Compile→Buffer or DTK→Lisp→Compile menu commands.

More Information

FAS files are also called FASL (Fast Load) files.

NOTE: Broadvision acquired Interleaf in January 2000 and later renamed the InterLeaf software to QuickSilver.

Programs that open FAS files
BroadVision QuickSilver
BroadVision Interleaf 6 and later
BroadVision QuickSilver
BroadVision Interleaf 6 and later
Updated 10/5/2009

About FAS Files

Our goal is to help you understand what a file with a *.fas suffix is and how to open it.

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