How to you re-texture cars?

So far I see people who have re textured the cars with custom images etc., what program do you use to edit the textures, because aren't they DDS files?

 

For DDS Files you can use a program such as Paint.net or Gimp, Or Photoshop to open

 

I've tried all 3, they don't recognize the file type.

 

For Photoshop, you need the NVIDIA Texture Tools:
https://developer.nvidia.com/nvidia-texture-tools-adobe-photoshop

 

I'll try to reinstall it, already tried.

 

Heres a pretty decent tutorial that may help you http://www.beamng.com/threads/1946-...als-and-Textures?p=24083&viewfull=1#post24083