Color books such as the Pantone books a user owns (.acb) couldn't be
opened. They are now read (never written), from public descriptions of
the format: their RGB, CMYK or Lab colors, named with the book's prefix
and suffix ("PANTONE 185 C"), as spot colors unless the book marks
them as process colors, leaving out the pages' unnamed padding. They
open from Window › Swatch Libraries › Other Library…, File › Open and
the user library folder like .ase files.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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