How to fix Photoshop CS3 startup error "One or more files in the Adobe Application Support folder" after upgrading to 10.6?
The problem is that /Library/ScriptingAdditions/Adobe Unit Types.osax isn’t loading. It’s possible the file is actually missing, but it’s more likely that you’ve upgraded to Snow Leopard.

Snow Leopard requires 64-bit versions of every plug-in, including OSAXes. The versions of Adobe Unit Types that shipped with CS3 and CS4 are 32-bit.

To fix this:


Download the 64-bit version of Adobe Unit Types.
Delete the old /Library/ScriptingAdditions/Adobe Unit Types file (when it's there).
Drag the downloaded Adobe Unit Types.osax file to your /Library/ScriptingAdditions/ folder.
Launch Photoshop.


sources:


http://paulschreiber.com/blog/2010/11/02/howto-fix-photoshops-missing-application-support-files-error/
http://helpx.adobe.com/photoshop/kb/unit-type-conversion-error-applescript.html