Folder Preview Pro

We launched Folder Preview a year ago on Mac App Store with a very simple idea in mind: quick look folders. Over time the app got some traction and people started to request new features, one of which is to open files with Folder Preview. We tried and failed at first because this was not possible with sandbox. But it never occurred to us that it was possible to get rid of the whole sandbox restriction. Until one day I was playing with another third-party app that offered a Quick Look extension, it suddenly hit me that this extension had a button to open its parent app. I dig around and eventually added these new features. By throwing away the sandbox restriction, the app is capable of opening files and showing thumbnails. You can even navigate folders if Full Disk Access is granted.