opening obj file doesn't open mtl file

Hi guy!

I’m having problems with 3d model. I’ve now tried five car model from different source. Those all have obj file and texture files in different form, mostly mtl files. I can create only one new texture, or bette, I can just replace that what ps is greated.

so am I doing something wrong or is it in progra?

i have done this before and there was no problems only different model now but same places for downloading and similar content in zip.