The "New folder" dialog allows you to add and configure settings for a real folder to be added to the active project. This dialog includes the following options.
Folder field
Set here the full path of the folder to be added to the active project. Use the Browse button to browse to and select the folder in a folder browser window.
Filter field
You can define here the extensions for files to be displayed within the added folder. Unless left empty, only files matching the extension(s) set here will be shown in the project. Use the Browse button to select pre-defined filters from the Explorer pane of the file view.
Link Folder to FTP/SFTP location
Checking this allows you to link the local folder you're adding to a remote folder on an FTP server so that you can sync files between the two. If this is checked, the following options are available: