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

There are 2 other file types using
the FSI file extension!

empty icon.fsi - FileSplit data

empty icon.fsi - FSI Viewer configuration

Detailed description

Software that open fsi file

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FSI file extension - Microsoft Visual F# signature data

What is fsi file? How to open fsi files?

File type specification:

Source code and script file type icon Source code and script file type

fsi file icon: fsi filetype icon

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.

The default software associated to open fsi file:

Microsoft Visual Studio icon

Microsoft Corporation logoMicrosoft Visual Studio  Multiplatform software

Company or developer:
Microsoft Corporation

Microsoft Visual Studio is an integrated development environment (IDE) used to create applications for Microsoft Windows, Windows Mobile, .NET Framework, Silverlight as well as dynamic websites and web applications. Visual Studio is available for Windows and Mac.

Help 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.

Related links:

About F Sharp on Wikipedia

List of software applications associated to the .fsi file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open fsi file, edit fsi file, convert fsi file, view fsi file, play fsi file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting fsi files.

Software that open fsi file - Microsoft Visual F# signature data

Programs supporting the exension fsi on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open fsi file action.

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