The Microsoft PowerToys utility collection contains a Cabinet file viewer, called CabView. The PowerToys utility pack is available from the Microsoft web site with URL "http://www.microsoft.com". The cabinet file view is a shell extension that makes CAB files look like folders. Once the CAB file viewer is installed, it works invisibly.
Double clicking on a CAB file opens it as if it were folder. At that time you can view the contents of the cabinet and you can copy individual files from the cabinet archive with the same techniques as inside the Explorer. You cannot however add files to cabinet or delete files from the cabinet.