FS File

What are FS files and how to open them

Are you having problems opening a FS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your FS files.

What is a FS file?

FS files have multiple uses, and F# (F-Sharp) Source Code is one of them. Read more about the other uses further down the page.

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 three FS openers that are compatible with this specific type of FS file.

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

Last updated: July 30, 2023

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 file extension. Different software may use files with the same extension for different types of data.

Final Burn Save File

We know that one FS format is Final Burn Save File. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

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

ZODB File Storage

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

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.

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.