3 steps to open file with MTL extension

Usually solving problems with MTL file is simple – just install proper software and open the file. Read the guide and open MTL file now!

MTL File Extension

  • File type OBJ Material Format
  • File developer N/A
  • File category 3D Image Files
  • File popularity rating
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What is a(n) MTL file?

A 3D graphic file with the extension .MTL stores material configuration data, saved in text format, including texture bitmap file names and their arrangement on a three-dimensional model saved in a parallel .OBJ file.


How to open MTL file?

There could be multiple reasons for which the system does not support given file. In the case of MTL extension, it is probable that none of the installed programs support given file type. Therefore, user should undertake the following steps

Step 1: Install a program that supports MTL files

If an application that supports MTL files is installed on user’s system, but is not used to open such files by default, right-click on the file icon and choose "Open with" option from the menu. Next, select the proper application and check the "Always use the selected application to open this kind of files" box. The system will store this information in its registry and use the selected program to open files with MTL extension by default.

Hint for Mac OS users


For Mac OS users the procedure is analogous – open the file menu by right-clicking on the MTL file and choose "Information" option and select "Open with program" option. From the submenu select an application and click on "Change all" button.

Step 2: Find and download proper software

Inability to open MTL files may also be related to the lack of any application that supports given file being installed on the system. Should that be the case, user needs to download and install one of the following applications. Once installed, the system will automatically associate newly installed application with MTL files. If this step fails, see step 1.

Programs that support files with MTL extension

Linux programs

Step 3: Check the MTL file for errors

Sometimes, although relatively rarely, steps 1 and 2 might not lead to expected results. There can be several reasons for such situation to occur:

  • MTL file has been downloaded from the internet but for some reason it is incomplete. In such case the file should be re-downloaded and opened again.
  • Structure of given MTL file could be corrupted and as such the program is not able to open the file
  • Storage medium on which the file was stored is damaged
  • It is important to ascertain that the icon representing given file is not a shortcut a related MTL file no longer present in the location to which the shortcut points
  • If the user account has restricted access privileges it is advised to contact the system administrator or an IT expert

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