The 7.5.2 Printing Fix extension is only seen under Mac OS 7.5.2; it was made unnecessary under Mac OS 7.5.3 and later. This patch was designed to solve printing problems and network slowdowns. It requires an Open Transport version 1.0.7 or later, and is inoperational on any Mac except for the Power Macintosh 7200, 7500, 8500 and 9500 (the first four PCI-based Power Macs).