I use Illustrator all day everyday and wanted to make all the files I save out to be able to be viewed in the Best new Feature of Leopad, Quick Look”. It is very easy to do all you need to do is download illust.qlgenerator.zip and unzip it to a convenient location. You then need to move it to the Quicklook folder in the Library. Mine was in the Main Drive / Library / Quicklook You may also find it in / Users / YOURUSERNAME / Library / QuickLook. It worked for me out of the box but it may require a restart to work well.