4 file types use the .mpj file extension.

What is an MPJ file?

Project file used by Minitab, a statistical analysis program used for business processes and quality management; contains all user work, including the data ( .MTW files), session history, graphs, and reports; used to compile multiple analysis resources together into single a project.

Category: Data Files

messiahStudio Project File

Project file created by messiahStudio, a 3D animation and rendering application; saves all project data in a single binary file; includes the scene ( .FXS ), cameras, objects, motions, and other model information; useful for sharing the whole project as a single archive.

Programs that open MPJ files

Updated: February 26, 2015

RoboHelp HTML Project

Project file created by older versions of RoboHelp, a help content authoring application; contains help content such as table of contents, written help information, and searchable indexes; commonly used in the process of generating software help manuals.

Newer versions of RoboHelp use the .XPJ extension. MPJ project files can still be opened in recent versions of RoboHelp.

Programs that open MPJ files

Updated: January 11, 2011

UNO R4 WiFi LED Animation Project

An MPJ file may also be a project file created by the Arduino LED Matrix Editor, an online tool used to create LED animations for the Arduino UNO R4 WiFi. It contains JSON-formatted data that describes an animation. Using the LED Matrix Editor, UNO R4 WiFi users can play the animation an MPJ file describes.

The Arduino UNO R4 WiFi is a 32-bit microprocessor that includes a 12 x 8 LED matrix. To program this matrix, users can either manually add animation frames to an Arduino sketch, or they can use Arduino's online LED Matrix Editor. After creating an animation in the LED Matrix Editor, users can send that animation to their Arduino UNO R4 WiFi.

Optionally, a user can save a copy of their LED Matrix Editor project as an MPJ file. This file is a JSON file that describes the animation a user has created, as a set of individual frames. Each frame's data begins with [{"matrix": .

The data an MPJ file contains is not what LED Matrix Editor sends to an UNO R4 WiFi to play an animation. (LED Matrix Editor converts the MPJ file's data to Arduino source code before sending it.) Thus, directly transferring an MPJ file to an UNO R4 WiFi will not allow you to play the animation it describes. Instead, you must open your MPJ file with LED Matrix Editor and then either:

You can open an MPJ file with Arduino's online LED Matrix Editor, to view, edit, and play the LED sequence it contains. To do so, click the Upload button found in LED Matrix Editor's upper-right corner. Then, navigate to and open your MPJ file.

You can also open an MPJ file with Microsoft Visual Studio Code or any other text editor, to view and edit the JSON-formatted data it contains.

You can use Arduino LED Matrix Editor to convert an MPJ file to an .INO (Arduino Sketch) file. To do so, click the </> button found in LED Matrix Editor's upper-right corner. LED Matrix Editor will then open a live preview of the resulting INO file. Click the Download button on this webpage's right side to download the INO file.

Programs that open MPJ files

Updated: August 30, 2023