Quicklook is a super cool mechanism allowing you to quickly check file contents without opening it in a specialized application. When you press the space bar on, for instance, *xlsx file, you can see the following preview without having MS Excel installed. While reading *OS Internals Volume I (that I highly recommend btw) I stopped on the Quicklook chapter. I found out that Quicklook registers com.apple.quicklook.ThumbnailsAgent XPC service that is responsible for ==creating thumbnails== data...| wojciechregula.blog