It was designed to work with a GUI editor called Constructor; unusually for such programs, Constructor was primarily a resource editor specializing primarily in UI elements, including several custom resource types, 'PPob' ("PowerPlant object" -- a general view description), 'CT Y P' (custom widgets), and Mcmd (used for dispatching menu-related events).
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Unix magic numbers and Macintosh data forks do provide some of this functionality, but the same is not true within DOS or Microsoft Windows environments.