There appears to be an option called WindowTitle for the SystemDialogInput, but it does not seem to do anything for me:
SystemDialogInput["FileOpen", WindowTitle -> "Please locate a file"] I would have thought it would place the requested text "Please locate a file" somewhere on the dialog window. Is this an OS or version dependent phenomenon? (I'm on Mac OS 10.14.2 and Mathematica 11.3.0).
