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.FAS File Extension


File Type 1 Compiled Fast-Load AutoLISP File  (Most common)
File Format File
Common? No
File Description Compiled script written in the Virtual LISP language; used for creating macros that can be run within AutoCAD, a 3D modeling program; contains a single AutoLISP routine.

By creating FAS scripts, AutoCAD users can automate common processes within AutoCAD.
Program(s) that open fas files Windows: Autodesk AutoCAD

File Type 2 QuickSilver Fast Save Lisp File
File Format Proprietary File
Common? No
File Description 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.

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

NOTE: Broadvision acquired Interleaf in January 2000 and later renamed the InterLeaf software to QuickSilver.
Program(s) that open fas files Windows / Unix: BroadVision QuickSilver; BroadVision Interleaf 6 and later

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/fas