How to open a ".gau" file

How do you open a ".gau" file to explore what gauges are contained in those lump files like Corsair! for example. How can I find out what gauges are contained therein?
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=16&t=37384
As I read the description it doesn't seem to apply to F/S 2k2 though.
How do you open a ".gau" file to explore what gauges are contained in those lump files like Corsair!