save additional Information in Treestore/Liststore


I want to create a list using Liststore that shows information about images 
(filename, filesize, width, height...).
But as a filename isn't unique (e.g. same name for two files in different 
directories), I need to store extra information in Liststore that shouldn't 
be visible for the user in order to distinguish different files with same 

Any ideas?

Thank you.


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