http://www.adobe.com/support/techdocs/331372.html
Activating the Photoshop CS2 Bigger Tiles plug-in
To enable the Bigger Tiles plug-in:
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Close Photoshop CS2.
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Locate the ~Bigger Tiles file inside the Photoshop CS2 plug-ins folder:
– Mac OS: Applications/Adobe Photoshop CS2/Plug-Ins/Adobe Photoshop Only/Extensions/Bigger Tiles
– Windows: Program Files\Adobe\Adobe Photoshop CS2\Plug-Ins\Adobe Photoshop Only\Extensions\Bigger Tiles
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Rename the file, removing the tilde, ~ , from the file name.
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Start Photoshop CS2.