When I get this error message it prevents me from opening excel documents.
"There was a problem sending the command to the program".
To resolve this error you can run the Microsoft Fix it article #50392
Click the link below:
See Instructions below before clicking the link above.
After you click on the Microsoft link above you will see following and should click on:
Fix this problem
Then, the download window will appear at the bottom of your screen. You will need to click on the Run button to start the process fix for #50392.