In Squeak6.0alpha-19537.image I don't see a class "ImageFormat'.

There is a class 'SmalltalkImage' which has an instance method
imageFormatVersion :

Smalltalk imageFormatVersion

print it returns: 68021

I believe that "Smalltalk" is some sort of global variable of class
SmalltalkImage

I must be missing something but ImageFormat  does not exist in my image, so      
ImageFormat fromFile: 'mySqueakImage.image'  does not work.

Or is the class ImageFormat something that you can download from some place
? (Sorry for beginner's question).



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