Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.FSPROJ.USER
File Type
Visual Studio F# Project User Options File
Category
Programming
Best first step
Use compatible software
Quick Summary
A practical overview of the .fsproj.user file format
An FSPROJ.USER file is a user-specific configuration file used by Microsoft Visual Studio and MSBuild for F# (F Sharp) programming projects. It is an XML-formatted file that stores local developer preferences and settings that are not intended to be shared across a team or version control system. T…
File extension
.FSPROJ.USER
File type
Visual Studio F# Project User Options File
Category
Programming
Recommended action
Open with a trusted compatible app
How to open a .fsproj.user file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .fsproj.user.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .fsproj.user file?
File extension details and usage information
An FSPROJ.USER file is a user-specific configuration file used by Microsoft Visual Studio and MSBuild for F# (F Sharp) programming projects. It is an XML-formatted file that stores local developer preferences and settings that are not intended to be shared across a team or version control system. These settings typically include debugging configurations, local machine paths, window positions, and specific build options that vary from one developer's environment to another. Because it contains environment-specific data, it is standard practice to exclude this file from source control systems like Git or SVN. If the file is deleted, Visual Studio will simply recreate it with default values the next time the project is opened and modified. It works in conjunction with the main .fsproj file, which contains the shared project structure and source file references. It is essentially the F# equivalent of the .csproj.user file used in C# development, ensuring that personal workspace preferences do not interfere with the build process of other team members.
Software Compatibility
Programs that may open or work with .fsproj.user files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .fsproj.user files be converted?
Options for saving or exporting this file to another format
In many cases, a .fsproj.user file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .fsproj.user file.
Why can't I open a .fsproj.user file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .fsproj.user format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .fsproj.user files
To open a .fsproj.user file, use software that supports this file format.
- Microsoft Visual Studio
- JetBrains Rider
- Visual Studio Code
- Notepad++
- TextEdit
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .fsproj.user file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.