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PowerMac HD icons 1.2 is a collection of 27 colorful icons representing various G3 and G4 Macs, such as: iMacs, iBooks and PowerBooks.
PowerMac_HD_Icons_1.2.sit (266.61 KiB / 273.01 KB)
PowerMac HD icons 1.2 / compressed w/ Stuffit
Those are classic Mac OS icons.
Emulating this? It should run fine under: SheepShaver