Thanks for the question. I understand that you are experiencing an issue creating an “Open file” alert in Calendar. If you have not already done so, let’s quit the calendar application and reopen it:
Once open, go ahead and give it another shot. If the window still does not appear, try going up to your menubar and choosing Window > Zoom.
Thanks Matt. I was able to quit and restart Calendar, no force quit required. Then, I found that one event allowed me to set the Open File... option correctly. But thereafter, it again failed to work.
Also, while I have Open File... selected, the menus are greyed out, so I can't choose WIndow --> Zoom. It just sits there with "Other..." selected (having changed it from "Calendar"). If I click Apply, there is no alert added at all, it just says "None".
Thanks for the follow up! If your issue persists after following the above resources, you may find more information by using another one of Apple's support channels - https://getsupport.apple.com/GetproductgroupList.action
- Matt M.