(NOTE: '~' indicates your user home directory. To access the ~/Library/ folder, from Finder, hold the option key and click the Go menu, then select the Library from the Go menu. Navigate to your ~/Library/Preferences/ folder and drag the file(s) listed in the section below to your desktop.To test a preference file, simply move the file from the default location to a different folder, for example a folder you create on your desktop. 'Testing' a preference file simply refers to removing the preference file from the default location (~/Library/Preferences/) and verifying that the Office application starts normally (the Office application will automatically re-create a preference file when it starts if the preference file does not already exist in the default location. plist files to determine if they are the source of the problem with an Office application. What does this procedure actually do and why am I doing it?