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I wasn't sure where to put this, so I opted for "Development".
This is the open source Explorer++ which has some very nice features. The source code is here;
One feature I particularly like is colour coding of file types, here I have set *.text files to green, and *.exe files to red;
You can set any file type to whatever colour you like. This may seem like "playing around", but it really does help to find things quickly in mixed directories.
there are also other useful features, one important one being that explorer++ does not have the same limitations on system files that the standard windows explorer ( and thus QTTabBar ) has.
Perhaps you can use some of that source code to add improvements etc?
At the moment I use Explorer++ in a "window" in QTTabBar, which I toggle on and off from my button bar. It would of course be very nice to have soem of these features directly in QTTabBar.
Coloring files by type is something I would love to do, but sadly, it's almost certainly impossible for the ItemsView. However, it should be possible for the SysListView. Make a Trac ticket for it and it'll happen eventually.