[Dr. Geo] Please explain difference between Smalltalk Sketches and DrGeo Sketches

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I am just begining with DrGeo and I am experimenting a bit with the system.

I like the DrGeo new example sketches and also the Smalltalk sketches in the 
SmalltalkSketchBrowser

Apparently - and this was not clear to me - there seems to be a difference 
between DrGeo sketches in the resources/sketches directory those are in .fgeo 
XML format and .png format and the resources/SmalltalkSketches which seem to be 
in .st format.

For example if I open DrGeo new and then try to open sketches Examples, I can 
see nice examples like Carré, Point de Fermat,, Cercle Droite d'Euler and many 
others.

My impression is that those examples are in the resources/sketches directory 
and they seem to be in .fgeo XML format.

On the other hand if I open the DrGSmalltalkEditor and save some code in 
MySketches this saves in a different folder called MySmalltalkSketches.

So this is a little bit confusing because I was assuming that the folder 
MySketches was used for "MySketches" but it is actually a different folder 
called MySmalltalkSketches.

Is there a relation between the DrGSmalltalkEditor and the DrGeo window please 
? Or are those two different methods of creating skecthes (one in .Fgeo format 
and the other one in .st format ) ?

Thanks !
David Stes