dos_getdir
(dos_getdir [title [folder
[info [allowNewFolder ]]]])
Opens the system's FolderSelect dialog to let
the user select a folder.
title : is the
FolderSelect dialog title; if omitted, a default title will be
used
folder : preset
folder to be selected when the dialog opens; if omitted, no folder
is preselected
info : optionally
an additional message to be shown at the dialog; if omitted, no
info is displayed
allowNewFolder : if T (default), it allows to create a new folder,
otherwise only existing folder can be chosen
Returns selected folder name when successful,
or NIL if dialog was cancelled.
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