.FSI File

The fsi file extension is associated with Microsoft Visual F#.

F# is a functional programming language for the .NET Framework. It combines the succinct, expressive, and compositional style of functional programming with the runtime, libraries, interoperability, and object model of .NET.

The fsi files are used for signature files used by Visual F#, a component of Microsoft's Visual Studio software development kit. The .fsi signature files contain information about the F# program element's public signatures, including types, namespaces, and other components.

The .fsi files can be used to specify accessibility rules to program code within an .fs file. This technique is used to restrict access to other program code that executes outside of the controlled .fs file.

The .fsi files always have the same filename as their associated .fs file.

An fsi file extension is related to the F# a functional programming language. An fsi file contains signature data.

How to open:

Use any of the Microsoft Visual Studio suites to work with .fsi files.

How to convert:

Conversion to other formats is not possible.