Solved - The action is only valid for product that are currently installed
I could open files from Excel but when I tried to open an excel file from any folder, I got the error
The action is only valid for product that are currently installed
I tried to repair Office app from the control panel but that didnt help either, so I compared the registry of the problematic system with the working one and found the following:
Apart from the default entry there was also a 'command' entry with garbled text.
I took the backup of the registry, deleted the 'command' entry and tested
I could now open Excel files without any issues.
Note: This can also apply to other office products