FSX File Extension
Visual F# Script Format
- File Type fsx
- Developer Microsoft
- Popularity
- Application Windows Notepad
- Category Developer Files
- Format Text
What is a FSX file?
Visual F# Script Format, identified by the FSX extension, is a Developer Files type and includes 1166 files.
The Visual F# Script Format (FSX), created by Microsoft, is one of file format they developed, and they also built 242 programs to support them.
FSX file support extends to various operating systems, including Mac OS, Linux and Windows. When working with FSX files, you can rely on 9 programs, including Microsoft Visual Studio, GNU Emacs and Windows Notepad.
Programs that support FSX files
How to open a FSX file?
If you can’t open a FSX file, it is usually because the necessary software is missing. To resolve the issue, select the right program from the list for your operating system. Then go to the official website of the developer, download the software, and install it.
When it comes to opening and working with FSX files, Microsoft Visual Studio, GNU Emacs and Windows Notepad are the top choices for users. To install the updated version of Windows Notepad, simply go to the Microsoft site and download the installer compatible with all major platforms.
Once the process is complete, Windows Notepad should take over as the default application for FSX files.
Set Windows Notepad as the default FSX program
Changing Default Programs in Windows
- Right-click on your FSX file, then choose the "Open with" option and select "Choose another application" from the available options;
- In the pop-up window, select the Windows Notepad application;
- Check the "Always use this application" checkbox, and then click "OK" to apply the selected application as the default for opening FSX files.
Change Default Program on Mac
- Right click or Control + left click on the desired FSX file;
- Select "Open in application" and click "Other";
- At the bottom of the window, you will find the "Enable" menu. Default, will be set to "Recommended Programs";
- Choose "All Programs" in this menu and search for Windows Notepad. Check the box next to "Always open in app" to make it the default program.
How to edit a FSX file?
To edit FSX files, it is essential to install software that supports not only viewing but also editing the developer files. Online FSX editors provide limited functionality compared to full-featured software for Visual F# Script Format.
List of Top FSX editors 2026
Based on the criteria above, here is a selection of FSX editors you can use.
| FSX Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| TextEdit | Apple | Mac OS | 4.8 out of 5 (40 reviews) |
| GNU Emacs | FSF | Linux | 4.7 out of 5 (33 reviews) |
| Gedit | GNOME | Linux | 4.6 out of 5 (38 reviews) |
| Notepad++ | Notepad++ Team | Windows | 4.6 out of 5 (37 reviews) |
| Sublime Text | Sublime HQ Pty | Windows, Mac OS, Linux | 4.6 out of 5 (39 reviews) |
| Nvu | Linspire. (Xandros) | Windows, Mac OS, Linux | 4.5 out of 5 (36 reviews) |
| Microsoft Visual Studio | Microsoft | Windows, Mac OS, Linux | 4.2 out of 5 (35 reviews) |
| Windows Notepad | Microsoft | Windows | 4.2 out of 5 (37 reviews) |
| Atom | - | Windows, Mac OS, Linux | 4.1 out of 5 (36 reviews) |
Solve problems with FSX files
Rest assured, any issues with FSX files can typically be addressed with simple software adjustments. See the tips below for help.
Why does Windows Notepad stop responding or crash intermittently?
Windows Notepad crashes can be caused by outdated software. Keep your Microsoft products up to date by installing the latest updates.
Restarting your computer will solve many common problems, which is why it’s the first thing you should do before changing any settings related to the software.
What are the best practices for repairing a FSX file that has gone bad?
Use a data recovery program to open the damaged FSX file and from the menu choose "Repair" function to start the repair process. Allow the recovery process to complete, which will automatically repair the damaged developer files.
What are the warning signs that my FSX file may be corrupted?
Common indications of damaged FSX developer files are:
- Error messages appear during the course of working with the file;
- Editing the archive in Microsoft Visual Studio results in slow or unresponsive behavior;
- Opening the file results in an error or a failed attempt;
- Unexpected expansion of the total size of the FSX file;
- Opening the file in Windows Notepad or other programs causes them to hang or crash;