This dialog is displayed when you click the Add Folder button on the Setup Your Mezzmo Library dialog.
Choose a folder on your computer that contains media files that you want to add into your Mezzmo library and that your want to stream to devices and web browsers inside your home and outside your home.
When choosing a folder, you should choose what type of files are contained in the folder - namely, video files, music files or photo files. This setting will help place the folder in the right location in the your Mezzmo library.