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MU File - What is a .mu file and how do I open it?
Learn about .MU files and view a list of programs that open them.
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Overview
What is a MU file? An MU file contains a 3D image used by Kerbal Space Program (KSP), a game where players build an alien space program. It stores data in a proprietary KSP model format for objects that appear in the game, which are typically space shuttles.
More Information Kerbal Space Program was released in 2015 for Windows, Mac, and Linux platforms. The gameplay revolves around developing a space program for aliens called "Kerbals," and includes designing and flying spacecraft. KSP utilizes MU files to store 3D models for space shuttles. The MU files are accompanied by part.cfg files, which reference the MU files as a mesh. There are also .MBM files referenced by the MU file that contain the textures for the model. NOTE: KSP models are typically built with Unity modeling software.
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DeveloperØrjan Johansen
Popularity2.0 | 1 Vote
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In-Depth
.MU File Extension
2 file types use the .mu file extension.
Kerbal Space Program Mesh File
| Developer | Squad |
| Popularity |
4.2 | 51 Votes |
What is a MU file?
An MU file contains a 3D image used by Kerbal Space Program (KSP), a game where players build an alien space program. It stores data in a proprietary KSP model format for objects that appear in the game, which are typically space shuttles.
More Information
Kerbal Space Program was released in 2015 for Windows, Mac, and Linux platforms. The gameplay revolves around developing a space program for aliens called "Kerbals," and includes designing and flying spacecraft.
KSP utilizes MU files to store 3D models for space shuttles. The MU files are accompanied by part.cfg files, which reference the MU files as a mesh. There are also .MBM files referenced by the MU file that contain the textures for the model.
NOTE: KSP models are typically built with Unity modeling software.
Common MU Filenames
model.mu - The 3D model mesh file used by Kerbal Space Program.
How to open a MU file
You can open MU files with Squad Kerbal Space Program, which is available for Windows, macOS, and Linux.
You can also import and export MU files with Blender (version 2.83 with the .mu import/export addon ). To add the addon to Blender and open MU files, follow these instructions:
Open over 400 file formats with File Viewer Plus . Free Download
Programs that open or reference MU files
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Windows
Squad Kerbal Space Program
Paid
Blender with the .mu import/export addon
Free
Mac
Squad Kerbal Space Program
Paid
Blender with the .mu import/export addon
Free
Linux
Squad Kerbal Space Program
Paid
Blender with the .mu import/export addon
Free
Category: 3D Image Files
Updated: April 6, 2021
Malbolge Unshackled Source Code File
| Developer | Ørjan Johansen |
| Popularity |
2.0 | 1 Vote |
An MU file is a source code file written in Malbolge Unshackled, a variant of the original Malbolge programming language. It may contain simple programs or demonstrations in plain text instructions that a Malbolge Unshackled interpreter or compiler can run.
More Information
While Ben Olmstead designed the original Malbolge language in 1998 to be challenging to use, Ørjan Johansen developed the Malbolge Unshackled language in 2007 to remove some of the restrictions of the original language and make it more practical for writing programs. MU files are typically created and used by programming enthusiasts and hobbyists who are interested in exploring esoteric languages and experimenting with unconventional approaches to coding.
How to open a MU file
You can open MU files with source code editors, including Microsoft Visual Studio Code and Brackets.io Brackets . Since MU files store plain text, any text editor will also support MU files, such as Microsoft Notepad and Apple TextEdit .
Programs that open MU files
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Microsoft Visual Studio Code
Free
Brackets
Free
Any text editor
Windows
Microsoft Notepad
Included with OS
Mac
Apple TextEdit
Included with OS
Linux
gedit
Free
Category: Developer Files
Updated: August 25, 2025