.FSSCRIPT File Extension
File TypeVisual F# Script
What is an FSSCRIPT file?
Script written in F#, a functional programming language formally introduced with Visual Studio 2010; meant to be run with the "F# Interactive" mode in Visual Studio; used for executing scripted F# code rather than compiling it into a .DLL or .EXE file.
NOTE: F# scripts more commonly used the .FSX extension.