Click in a dialog box without creating a selection

Does anyone know if there is a registry setting which turns off automatic selection of a previous entry in dialog boxes?
This isn't specific to Dopus - it's a Windows thing. By way of example, if the address bar in Dopus contains e.g. "o:\Downloads" and I click once in the bar, that path is automatically selected. If I want to edit what's there, as is often the case, I then have to click again to position the cursor before I can change anything. I've searched around but it's difficult to know exactly what to search for - 'common dialog auto select' etc, for example, doesn't do it.
Any suggestions greatly appreciated,