Adobe Illustrator CS3 Software Development Kit
Frequently Asked Questions (November 2007)

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1. What about Leopard?
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Mac OS X 10.4 (Tiger) with Xcode 2.4.1 remains the recommended 
platform for Adobe Illustrator CS3 SDK plug-in development.
Plug-ins developed under this platform will
load and run under Mac OS X 10.5 (Leopard). Development 
under later versions of Mac OS such as Leopard and
Xcode 3.0 may be possible but is not recommended.