Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.CSX
File Type
C# Script File
Category
Programming
Best first step
Use compatible software
Quick Summary
A practical overview of the .csx file format
The CSX file extension represents a C# Script file, which is a specialized version of the standard C# source code file. Unlike traditional .cs files that must be part of a structured project and compiled into a Dynamic Link Library (DLL) or an Executable (EXE) before they can be run, CSX files are…
File extension
.CSX
File type
C# Script File
Category
Programming
Recommended action
Open with a trusted compatible app
How to open a .csx file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .csx.
- 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- Update the application if the file was created by a newer version of the software.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 .csx file?
File extension details and usage information
The CSX file extension represents a C# Script file, which is a specialized version of the standard C# source code file. Unlike traditional .cs files that must be part of a structured project and compiled into a Dynamic Link Library (DLL) or an Executable (EXE) before they can be run, CSX files are designed for direct execution. They utilize the Roslyn compiler's scripting engine, allowing the code to be interpreted and executed line-by-line or as a single script without a formal build process. This format is particularly useful for automation, administrative tasks, and rapid prototyping within the .NET ecosystem. CSX files support unique scripting directives such as '#r' for referencing external assemblies and '#load' for including other script files, which are not valid in standard C# source files. They are commonly used in Azure Functions, the C# Interactive window in Visual Studio, and with the 'dotnet-script' tool. By removing the need for boilerplate code like namespace and class declarations, CSX provides a lightweight, 'top-level' coding experience similar to Python or PowerShell, while maintaining the full power and type safety of the C# language.
Software Compatibility
Programs that may open or work with .csx files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .csx files be converted?
Options for saving or exporting this file to another format
In many cases, a .csx 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 .csx file.
Why can't I open a .csx file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .csx 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 .csx files
To open a .csx file, use software that supports this file format.
- Visual Studio
- Visual Studio Code
- LINQPad
- .NET SDK (csi.exe)
- JetBrains Rider
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 .csx 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.