Tools/Options.../Show gridlines in details view

System Default:   Yes

Enabling this option adds gridlines to the file list (ie. Listview control) in the current tab, turning this:

into this:

This option is only valid in Details view.

    Bug: Windows XP users only - Microsoft acknowledges a bug in the List-View control when using the LVS_EX_GRIDLINES extended style (ie. gridlines).  Under some conditions, the grid is not refreshed correctly when scrolling/paging and may be drawn incorrectly.  Lines may also be omitted.  Here is an example - notice that the spacing between faulty lines appears to be out by 1 pixel:

The bug was apparently fixed in Windows Vista.  This is NOT an Explorer++ bug!