When I import swatches using the “Import Palette…” item, I should be able to select palettes saved from Photoshop (ACO – Adobe Photoshop Color Swatch File) or Illustrator (ASE – Adobe Swatch Exchange File).
Are there foreign palette formats that AD can import? Maybe that information should be in the Open dialog box… or somewhere. (The Help Center doesn’t seem to do anything. I can search for a topic like “palette,” but can’t expand the results, so maybe the AD entries are just stubs?)