File Extension FS

.FS File

File extension: FS
File type: Source Code


Notes about the FS file extension:



To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened" (Windows 7) or "How do you want to open this file?" (Windows 10) if you double-click the file. There click on "More apps" and choose a suitable software to view such files on your PC or from email attachments.

The FS file type is primarily associated with 'F#' by Microsoft Corporation.

F# (pronounced F Sharp) is a scalable, succinct, type-safe, type-inferred, efficiently executing functional/imperative/object-oriented programming language.

It aims to be the premier type-safe functional programming language for the .NET framework and other implementations of the Ecma 335 Common Language Infrastructure specification.

F# was partially inspired by the OCaml language and shares some common core constructs with it.

The inputs to the F# compiler or the F# Interactive dynamic compiler consist of source code files, with extensions .fs, .fsi, .ml, .mli, .fsx, .fsscript.

  • Files with extension .fs, .ml must conform to grammar element implementation-file.
  • Files with extension .fsi, .mli must conform to grammar element signature-file. 
  • Files with extension .fsx and .fsscript are processed just as for those with extension .fs except that the conditional compilation symbol INTERACTIVE is defined instead of COMPILED, the assembly FSharp.Compiler.Interactive.Settings.dll is referenced by default, and the namespace Microsoft.FSharp.Compiler.Interactive.Settings is opened by default.

Detailed information for file extension FS:


Primary association: F#
Company: Microsoft Corporation
File classification: Source Code
Related links: F# Download, Exploring the FSharp Language Series

Other applications associated with file type FS:

  • FlexiSIGN File by Scanvec Amiable
  • FormSaver File
  • Gforth (Forth Stream Source File) by Free Software Foundation, Inc.Gforth is a fast and portable implementation of the ANS Forth language. This association is classified as Source Code.
  • NetBSD File(usually BOOT.FS)
  • PDT Feature Structure File
  • Taskmaster (Paper Keyboard FormSpec) by Datacap Inc.Taskmaster is a unified data and document capture system. Batch Pilot makes it easy to create document-specific verify panels for every document type in your workflow. The .FS file is a structured text file describing the layout (data zones and processing instructsions) of one or more forms or page types. This association is classified as Text.
  • Usenix FaceServer (Bitmap) This association is classified as Graphic.



To change file associations press Windows Key + X and then Apps and Features > Default apps > Choose default apps by file type. Invalid file associations could be the result of underlying issues within your Windows PC.

Technical data

To view technical data on file-extension FS click this link to expand/hide the additional area.

System Info for File Extension .FS

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and information FILExt collected directly from user systems.

ProgramID: hclftp
EXEFile: %ProgramFiles%\exceed.nt\ftp.exe %1

ProgramID: Hummingbird.Hclftp
EXEFile: %ProgramFiles%\Hummingbird\Connectivity\8.00\Accessories\ShlFtp.exe %1

ProgramID: PerForm.FormSystem
EXEFile: C:\FormFlow\dffill.exe

ProgramID: soffice.StarFrameDocument.5
EXEFile: %ProgramFiles%\OpenOffice.org1.0.1\program\soffice.exe %1

ProgramID: Hummingbird.Hclftp
EXEFile: %ProgramFiles%\Hummingbird\Connectivity\11.00\Accessories\ShlFtp.exe

ProgramID: hclftp
EXEFile: %ProgramFiles%\HostExplorer\ftp.exe


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