File Extension FS

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.