not OP, but in macOS, you can drag a file onto a dock icon and that program will open the file if possible. very handy - i use it with Xld, an audio transcoding app. it runs quietly in the background and whenever i need to convert a bunch of FLACs to MP3 (or whatever) i can just drag the folder to the icon and 10 seconds later everything is good to go, without ever really directly interacting with Xld.