I was wondering if there is some kind of preview extension that could be added to windows or mac or linux, that allows to preview a file in the folder. For example if I have a pictures folder, there are thumbnnails showing automatically. The same features for PCBs and schematics would be very helpful.
Usually this is done by the OS, creating thumbnails as required for common graphics formats like JPG, PNG, GIF, and PDF. For it to do the same for other formats it would have to be recognise Kicad file extensions and call a helper to generate a thumbnail. I donât know whether file managers can be customised for this and how.
Since thumbnails are only for quick recognition, why not print the schematic in PDF as a matter of habit, and save a 3D view of the PCB as a matter of habit, and then you have your previews when you enter that directory?
Although not showing the Kicad schematic or board files, Cuprum (https://www.wortum.com/cuprum/), a macOs Gerber viewer, comes with a quicklook plugin so you do get a preview of your Gerber files. Obviously not sufficient to identify a minor change but enough to identify your project. There is a free (and a paid for) version.
I donât believe this is something you as an end-user of KiCAD would be able to do; the KiCAD developers (and of course you can be one of those if you wish, since itâs an open source project) would need to implement file preview support in KiCAD itself and then the installer for each operating system would need to register the proper handler.