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Thanks for posting, glad to know I'm not alone...

Generally by simply clicking on the file from W11 File Explorer.

Running Softmaker Office 2018 Anniversay Update - thus the post in the 2018 forum.

sminof.txt attached. Ran "Check for updates" and at the current level for this release.

A few weeks ago I noticed that when I opened an .xlxs file PlanMaker would launch, but it stopped opening the selected file. I can open it manually without problems via history or manually searching for the file.

Around the same time I did upgrade Windows 11 to 2H22. Could that be related?