ai Space.Īs a solution for fast preview without the need to open Adobe Illustrator or Photoshop for each file, this is the easiest. It is available both preview thumbnail (small icon) in FinderAnd in the way preview fileBy selecting the file and pressing. PSD, without the need to install any application. AI files ( Adobe Illustrator) And is native. psd ( Adobe Photoshop) in folders where they are stored, OS X users have a big advantage over the Windows.