Go here ( ) and download VTFEdit, once downloaded click File System and locate your file, double click on it and then click OK, then save it.ĭelete the automatically generated VMT file created by VTFEdit and create an identically named file and open it with notepad, copy this into the file: The dimensions of the image should be powers of 2, common values and 512 x 512, however use 1024 x 1024 for a higher quality skybox. Create the image in an editing software such as Paint.NET or Gimp.