File Extension Library

.FS File Extension

  • Developer by: Microsoft
  • Category: Developer Files
  • Format: Text

What is an .FS file?

.FS file extension is created by Microsoft. .FS has been classified as Developer Files. The format of .FS file is Text.

.FS is Visual F# Source File

Source code file written in Microsoft's F# (pronounced "F Sharp") programming language, which is a variant of the ML language; can be written using the Visual F# component of Microsoft Visual Studio 2010; used for compiling F# code into .DLL or .EXE program executables.

F# is designed for use with Microsoft's .NET library and tools. It was formally introduced with Microsoft's 2010 release of Visual Studio.

List of all softwares that can open the Visual F# Source File
Microsoft Visual Studio 2017
File Type 2:

Mac OS X File System Plug-in

Developer by: Apple Category: Plugin Files

Plugin that enables support for a certain file system in Mac OS X; allows the Mac operating system to recognize hard drives and other media formatted with different file systems.

Examples of file system plugins include "hfs.fs," "msdos.fs," and "cd9660.fs." Each FS file is saved as a Mac OS X bundle, but is defined as a plugin. They are stored by default in the "/System/Library/Filesystems" directory.

NOTE: FS files should not be opened manually since they are system files.

List of all softwares that can open the Mac OS X File System Plug-in
Apple OS X
File Type 3:

FlexiSIGN Document

Developer by: SA International Category: Vector Image Files Format: Binary

Image file created by one of SAi's Flexi FAMILY software products; stores the text, graphics, dimensions, and plotting properties for a sign; used for printing banners and other signs on large-scale plotters and cutters; can be exported as a .PDF or .EPS file using the software.

Flexi FAMILY products include FlexiSIGN, FlexiSIGN-PRO, FlexiEXPERT, FlexiPRINT & CUT, FlexiLETTER, FlexiDESIGNER, FlexiENGRAVE, and FlexiENGRAVE-PRO.

List of all softwares that can open the FlexiSIGN Document

How to Open .FS file on different platforms

Open .FS File on Windows

  • Right-click a .FS
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .FS file and Select check box "Always use this app to open .FS files" Press "Ok"

Open .FS File on Mac

  • Right-click (or Ctrl + Left-click) the .FS file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .FS File on Linux

Right click on the .FS file, choose "Open with" and select a program from the list above

Open .FS File on iPhone

Select a file. If you don't see an application to open the .FS file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .FS File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .FS files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .FS files

  1. You need to update the application that you normally use to open .FS files. Only the latest version of the software supports the current .FS file format
  2. You need to check the .FS file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)