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In a total reversal of what Windows and Macintosh users might expect, Adobe Creative Suite 4 will include 64-bit support for the Windows platform, but not for Mac.

Mac OS X users probably won’t get 64-bit support until CS5, the subsequent release of the graphics editing software, according to John Nack, Adobe’s Photoshop product manager.

Nack attributes this unanticipated state of affairs to Apple’s decision last year to halt development of 64-bit support for Carbon, a move which he says took Adobe and third-party developers by surprise. Adobe did make CS3 Intel-compatible, but kept Carbon as its core architecture.

Adobe CS4 will be 64-bit, but only on Windows

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