Okay I just added this for the next update. To use it, you'll use the paintdotnet: protocol prefix.   For example, you can to to Start -> Run, and then type in:   paintdotnet:path_to_file_1.jpg "path_to_file_2 that has spaces.png"   And it'll open both of those files. This works both to launch Paint.NET from scratch, and to open files in an instance of Paint.NET that's already running.   It wasn't too hard, just a mix of a small addition to the AppX
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