FS File Type

- The quick facts

What are FS files and how to open them

Are you having problems opening a FS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a FS file?

FS files have multiple uses, and F# (F-Sharp) Source Code is one of them.

F# (F-Sharp) Source Code File

The .fs file format is used for source code in the F Sharp programming language. F sharp (F# in some context) is designed for use with Microsoft's .NET library and tools. F# is a strongly typed functional-first language that uses type inference.

The programmer does not need to declare types—the compiler deduces types during compilation. F# also allows explicit type annotations, and requires them in varying situations.

FS files are source code files written in Microsoft's F# (pronounced "F Sharp") programming language is one of several ML (Meta Language) programming languages. FS files can also be written using the Visual F# component of Microsoft Visual Studio.

FS files are developer files used for compiling F# code into DLL or EXE program executables.

How to open FS files

We have identified 3 FS openers that are compatible with this specific type of FS file.

Programs that open F# (F-Sharp) Source Code files

Microsoft Visual StudioMicrosoft Visual StudioVerified
UltraEditUltraEditVerified
Notepad++Notepad++Verified

Last updated: May 31, 2022

All known file formats using extension .FS

While F# (F-Sharp) Source Code File is a popular type of FS-file, we know of 3 different uses of the .FS extension. Different software may use files with the same extension for different types of data.

ZODB File Storage

The Zope Object Database (ZODB) is an object-oriented database for transparently and persistently storing Python objects to disk.

While we have not verified the apps ourselves yet, our users have suggested 10 different FS openers which you will find listed below.

More file formats using the FS extension

Through our research of FS files, we know that the following formats exist. However, we have not yet analyzed them in detail.

  • Final Burn Save File

Various apps that use files with this extension

These apps are known to open certain types of FS files. Remember, different programs may use FS files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Hummingbird Shared ComponentsHummingbird Shared ComponentsUser submitted
Xamarin StudioXamarin StudioUser submitted
FormFlowFormFlowUser submitted
Microsoft Application VirtualizationMicrosoft Application VirtualizationUser submitted
Open Text Shared ComponentsOpen Text Shared ComponentsUser submitted
Kryptel Enterprise EditionKryptel Enterprise EditionUser submitted
CompuPic ProCompuPic ProUser submitted
Kryptel Standard EditionKryptel Standard EditionUser submitted
Teamcenter VisualizationTeamcenter VisualizationUser submitted
Hummingbird ConnectivityHummingbird ConnectivityUser submitted

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about FS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.