what does stringWithFormat: %g doing? (Windows question)

[Lloyd Dupont]

Looking at NSGeometry I found that:
===
NSString*
NSStringFromRect(NSRect aRect)
{
 setupCache();
 if (GSMacOSXCompatibleGeometry() == YES)
   return [NSStringClass stringWithFormat:
     @"{{%g, %g}, {%g, %g}}",
     aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height];
 else
   return [NSStringClass stringWithFormat:
     @"{x = %g; y = %g; width = %g; height = %g}",
     aRect.origin.x, aRect.origin.y, aRect.size.width, aRect.size.height];
}
===

Thta raises 2 questions:
1. what is GSMacOSXCompatibleGeometry() ? is it always TRUE/YES?
2. what is the %g format?
I ask that because one application I have written which parses this string, 
fails on my dad's computer (which is France) but succeed here (in 
Australia), so I was wondering if there was some kind of 
internationalizatino involved?


Regards,
Lloyd Dupont

NovaMind development team
NovaMind Software
Mind Mapping Software
<www.nova-mind.com>