Excel cannot be opened because of a problem

"Microsoft cannot be opened because of a problem” error ...
https://support.microsoft.com/en-us/help/2431353/microsoft-program-cannot-be-opened-because-of-a-pro・・・

Photos cannot be opened because of a problem | Apple iOS MacOS ...
https://www.mac-forums.com/forums/showthread.php?330193-Photos-cannot-be-opened-because-of-a-problem・・・

macos - Apps "cannot be opened because of a problem" - Ask Different
https://apple.stackexchange.com/questions/225832/apps-cannot-be-opened-because-of-a-problem?rq=1

SophosUIserver cannot be opened because of a problem - Sophos ...
https://community.sophos.com/products/free-antivirus-tools-for-desktops/f/sophos-anti-virus-for-mac-・・・

Microsoft Office Word Not Opening 1-888-828-6821 Or Responding In ...
http://www.itfixtech.com/blog/microsoft-word-not-opening

Mac 版 Office Insider Fast 更新情報: パソコンのツボ 〜Office のTIP
http://pcclick.seesaa.net/article/451606618.html

I have a Mac operating system 10.6.8 and have used it for about 15 ...
https://www.justanswer.com/mac-computers/6eonj-mac-operating-system-10-6-8-used.html

Just wanted your advice on the message "Microsoft Excel cannot be ...
http://www.justanswer.com/mac-computers/99cu0-just-wanted-advice-message-microsoft-excel.html

I have Microsoft word for Mac version 15. When I try to open earlier ...
https://www.justanswer.com/mac-computers/abold-microsoft-word-mac-version-15-when-try-open.html