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When the user of your application specifies a file name without an extension, the System.Windows.Forms.FileDialog appends an extension to the file name. The extension that is used is determined by the FileDialog.Filter and FileDialog.DefaultExt properties. If a filter is selected in the System.Windows.Forms.FileDialog and the filter specifies an extension, then that extension is used. If the filter selected uses a wildcard in place of the extension, then the extension specified in the FileDialog.DefaultExt property is used.