It would be nice if there were an option to use the old file grouping in the "Files" View (as it was implemented in TXC 2.0 Alpha 3).
The feature has been added to the official feature list.
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This means that there are "Graphic files", "Bib files", "Tex files" and such. Not sure if we can then continue to have Windows Explorer support in such a tool window. Maybe we just allow this as an additional window.