How to import a non made by me track on STK track editor?

[MxtApps]

Hello,

It seems stupid but, how can I import an STK built-in track or an addon track on STK track editor? I press CTRL+O, and a file selector is displayed, but I do not know what file should I choose. It do not lets me to open a directory, and when I try to open any file of the track directory, it says something like: Cannot open file, signature failed. So is there a way to open them? How?

Thanks in advanced.

[benau]

use blender to open the source of the track, stk editor is not supported

[MxtApps]

I can, but in Blender textures are not applied, so I have the track in black and white.

[benau]

Try use blender 2.79 to open current tracks