http://bugs.winehq.org/show_bug.cgi?id=3148
------- Additional Comments From andi@rhlx01.fht-esslingen.de 2005-26-07 02:56 ------- Hi,
what does "the moment I drag" mean? Does it happen the very moment you left-click on it (WM_LBUTTONDOWN) or the very moment you start *moving* the clicked file (~ group)?
Is it a treeview or a listview? (since you say "file explorer" which I assume is the Windows Explorer, it's ambiguous, since its left pane is a treeview whereas its right pane often is a listview)
Maybe look for WM_LBUTTONDOWN/WM_LBUTTONUP changes in the diff between releases. (the single-file re-select in Windows Explorer happens on mouse button *release*, not *click*, which might be what is broken somewhere in Wine, since it shouldn't deselect those three files on a WM_LBUTTONDOWN already)