From: http://www.racesimcentral.net/***.com/
"Let the Editing Begin!
Now available for download is ReadMas by Joaquim Pereira. This
excellent utility will unpack any mas file from SCGT, allowing the
extraction of bitmap files and much more - which will enable much to
be edited, such as the dashboard, the cars and a lot more! Go get it
from the Editors section of the Downloads page now. This is sure to be
the most popular download yet!"
--
-Gunslinger-