Extension and Driver Resource Files
Each printing extension and printer driver is implemented in a file of resources. Code segments of a printing extension must have the file type'pext', and code segments of a printer driver must have the file type'pdvr'. If the file does not have the correct resource type, QuickDraw GX cannot recognize it as an extension or driver.The creator type of each printing extension must be unique. The only way to guarantee uniqueness is to register the creator type with Macintosh Developer Technical Support. This is highly recommended because QuickDraw GX relies on the uniqueness of the creator type.
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