What Is an MAT File?

How to open, edit, & convert MAT files

A file with the MAT file extension is most likely a Microsoft Access Table Shortcut file that's used to quickly open a table without having to first open the MS Access program.

The MathWorks MATLAB program uses MAT files, too, but as a container for holding data like functions and variables.

This file extension is also used in 3D design software to denote a file that stores things like textures and images. These are called 3ds Max Materials files, Vue Material files, or V-Ray Materials files.

MAT files in Windows 10 that open with MS Access

How to Open an MAT File

MAT files that are Microsoft Access Shortcut files can be created by dragging a table out of Access and to the desktop or into another folder. Microsoft Access needs to be installed in order to use them.

The MathWorks MATLAB can open MAT files that are used by that program.

If your file isn't in either of those formats, it might instead be a Materials file used in 3D design software. Autodesk's 3ds Max and E-on Vue use MAT files. Chaos Group's V-Ray plugin can load one into 3ds Max and MAXON CINEMA.

The Unity game engine may use MAT files as well.

Use a free text editor to open it if none of the above programs are working for you. It's possible that a different program created it and stored the information in a plain text file. This isn't the case for any of the above cases, but it might be for yours.

If you find that an application on your computer tries to open the file but it's the wrong application or you'd rather have another installed program open it, see our How to Change the Default Program for a Specific File Extension guide for making that change in Windows.

How to Convert an MAT File

There's no way to convert a Microsoft Access Table Shortcut file, and there's also probably no reason to want to convert this type of file.

However, MAT files that are used in other programs as Materials files probably can be converted. This is likely possible through the program that uses the file.

So if you're wanting to convert one that's used with E-on Vue, for example, you should be able to open the file there and save to another format. This is normally possible though a Save As or Export option in the File menu.

If you're looking to convert 3ds Max Materials files to a format that's supported by previous versions of the software, see these instructions.

MATLAB can convert MAT to CSV. See the instructions at MATLAB Answers if you need help, as well as this documentation on csvwrite. Follow that same MATLAB Answers link to search around the site if you need help converting MAT to TXT or another text-based format.

Still Can't Open It?

MAT files aren't the same as .MATERIAL files, which are Rigs of Rods Texture Reference files used with the Rigs of Rods 3D simulator game. Atomic Combat Saved Game files is another file format that has a similar extension of .MATO, but those open with Atomic Combat.

Despite those file extensions looking like they're related to MAT files, they're actually in their own format and therefore open with their own programs.

  • How do I access the data of MAT file in MATLAB?

    You can check the contents of and load specific data from .mat files in MATLAB using the matfile function. Entering matObj = matfile(filename) creates a matlab.io.MatFile object connected to the MAT-file specified by filename.

  • How do you save a table as a MAT file in Microsoft Access?

    MAT files are Microsoft Access Table (MAT) shortcut files. You can create a MAT file in Access by clicking and dragging a table to your desktop.

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