CSPROJ File Extension
Visual Studio C# Project
- File Type csproj
- Developer Microsoft
- Popularity
- Application Microsoft Expression Blend
- Category Developer Files
- Format XML
What is a CSPROJ file?
Visual Studio C# Project, identified by the CSPROJ extension, is a Developer Files type and includes 1166 files.
With the creation of the Visual Studio C# Project (CSPROJ), Microsoft introduced file format along with 242 programs built for their use.
CSPROJ files are supported by Windows, Linux and Mac OS. You can open a CSPROJ file using one of 10 programs, for example Microsoft Visual Studio, Atom and Sublime Text.
Programs that support CSPROJ files
How to open a CSPROJ file?
The most common reason why a CSPROJ file cannot be opened is the absence of required software. To fix this, select a compatible program from the list. Then visit the official developer website via the provided link, download the program, and install it on your system.
The most popular programs for working with CSPROJ files are Microsoft Visual Studio, Atom and Sublime Text. To get the latest version of Microsoft Expression Blend, open the Microsoft website where a universal installer for all operating systems is available.
Once setup is done, your operating system should assign Microsoft Expression Blend as the default app for CSPROJ files.
Make Microsoft Expression Blend the default CSPROJ viewer
Changing the default program in Windows
- Start by right-clicking on your CSPROJ file and selecting the "Open With" option. From there, click "Choose another app" to continue;
- Inside the popup window, scroll through the list of applications and specifically choose Microsoft Expression Blend as the application to associate with your CSPROJ file;
- Check the "Always use this app" checkbox and click "OK".
Change the default app to open files on Mac
- Right click or use Control + Left Click on the desired CSPROJ file to access a dropdown menu of actions;
- Select "Open in application" and click "Other";
- Scroll down to the bottom of the window, where you will find the "Enable" menu. Default, "Recommended Programs" will be selected;
- In this menu, choose "All Programs" and navigate to Microsoft Expression Blend. Check the box next to "Always open in app" to make it the default program.
How to edit a CSPROJ file?
To edit CSPROJ files, you need to install specialized software that allows you not only to open but also to modify developer files. Online CSPROJ editors usually provide fewer features than software created specifically for Visual Studio C# Project.
List of Top CSPROJ editors 2026
Following these criteria, we have put together a list of recommended CSPROJ editors.
| CSPROJ Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| TextEdit | Apple | Mac OS | 4.8 out of 5 (40 reviews) |
| Windows Notepad | Microsoft | Windows | 4.8 out of 5 (35 reviews) |
| GNU Emacs | FSF | Linux | 4.7 out of 5 (33 reviews) |
| Visual Studio Code | Microsoft | Windows, Mac OS, Linux | 4.7 out of 5 (38 reviews) |
| Gedit | GNOME | Linux | 4.6 out of 5 (38 reviews) |
| Microsoft Expression Blend | Microsoft | Windows | 4.6 out of 5 (36 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) |
| Microsoft Visual Studio | Microsoft | Windows, Mac OS, Linux | 4.2 out of 5 (35 reviews) |
| Atom | - | Windows, Mac OS, Linux | 4.1 out of 5 (36 reviews) |
Finding answers to CSPROJ file problems
If you encounter issues with CSPROJ files, don’t worry—most can be fixed with minor software adjustments. Refer to the troubleshooting tips below.
What are the signs that my CSPROJ file is damaged?
Corrupted CSPROJ developer files may have one or more of the following symptoms:
- Poor performance when editing a file in Microsoft Visual Studio;
- Opening or processing the file in Microsoft Expression Blend or other programs causes instability or crashes in the program;
- The file shows errors when trying to open it or does not open completely;
- Unexpected expansion of the total size of the CSPROJ file;
- Working with the file triggers the display of error messages;
Why does Microsoft Expression Blend quit or crash unexpectedly?
Microsoft Expression Blend crashes can be attributed to outdated software. Make sure you have installed the latest updates for Microsoft products.
A computer restart is often the key to solving numerous common problems. That’s why, it is recommended to restart the computer before making any changes to the software settings.
What methods can be used to repair a damaged CSPROJ file?
Use a recovery program to open the damaged CSPROJ file and navigate to the "Repair" menu item. Wait for the recovery process to finish, as it will automatically repair damaged developer files.