Selecting this menu item does the exact same thing as clicking the 'Scan' button in the main BugScan window. You can perform a full scan or a quick scan by clicking once on a volume in the 'Volume List' window.
Scan File...
Scans a single file only (the quick scan and full scan radio buttons have no effect on this function).
Scan Folder...
Scans an entire folder (the quick scan and full scan radio buttons have no effect on this function).
Isolate
Selecting this menu item does the exact same thing as clicking the 'Isolate' button in the main BugScan window. See the section entitled 'What To Do When...' for information on how to isolate files.