#=1) The common dialog boxes, such as the Open dialog box (of say, Notepad), display the places bar on the left side. These are shortcuts to common folders, which make getting around much easier. By default, you see the History, Documents, Desktop, Favorites, and My Network Places folders there.
#=You can hide it with this tweak.
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#=2) This option can be used to remove the 'back' button which helps to browse to the previously accessed folder.
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#=3) The 'filename' text field has a drop-down list that remembers the recently typed filenames. Use this tweak to disable that feature if you need some privacy.
#=\n4) The fourth option can be used to enable autocomplete in the filename edit box.