This should cause confusion for Windows users:


1. It doesn't conform to windows design - https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/keys_general.mspx?mfr=true

CTRL while dragging an item - Copy selected item.

2. you have to hold SHIFT before starting to drag and item, on Windows you can start holding Ctrl at any time while dragging and it modifies the dragging action (copy or move)