Mtl extension is related to Alias Material file. You can try to open mtl files with Autodesk Maya or 3dsmax software.
Mtl files stand for material file. These material files used with Alias firm which produces 3d softwares. You may find texture images, coordinates and other components in these files. A part of Alias Firm was bought by Autodesk. To get detailed information about mtl files, you can check following links.
What to use mtl
Autodesk Maya or 3dsmax
which page related to mtl file
mtl Related Searches
You can check related links about mtl fileextension.