User Defined Startup Folders
From ZBrush Info
In Zbrush 3, you can customize your startup environment. If you use specific alphas, texture, materials and/or ZBrush plug-ins than you can place them in the ZStartup folder of your root ZBrush directory.
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How To Use Startup Folders
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Alphas
Simply place your grey scale 16 bit alphas in the ZStartup/Alphas folder.
