MediaBay

Show File Extensions in Results List: Activate this to display file name extensions in the Results list.
Maximum Items in Results List: This allows you to specify the maximum number of files that are displayed in the Results list. This helps you to avoid unmanageably long lists of files in the Results list.
Allow Editing in Results List: Activate this to edit attributes also in the Results list. Otherwise, editing can only be done in the Attribute Inspector.
Scan Folders only when MediaBay is open: Activate this to scan Cubase for media files when the MediaBay window is open. Otherwise, the folders are scanned in the background even when the MediaBay window is closed.

Note
During playing back or recording no folder scans are performed.
Scan unknown File Types: Activate this to open and scan any file in the search location and ignore files that cannot be recognized.