Describes the cause and action for error messages.
Error Message(English)：
2010 not opening multiple files
microsoft excel 2016 - Multiple instances upon ...
https://superuser.com/questions/1271049/multiple-instances-upon-opening-multiple-office-documents
Excel: Do not open files in multiple instances
https://superuser.com/questions/829384/excel-do-not-open-files-in-multiple-instances
How to make multiple Excel files open in ONE ...
https://superuser.com/questions/479639/how-to-make-multiple-excel-files-open-in-one-window-instance-・・・
Open Excel files in new window
https://superuser.com/questions/21602/open-excel-files-in-new-window
Each WORKBOOK in separate windows Excel 2010 Windows 7 - Microsoft
https://social.technet.microsoft.com/Forums/ie/en-US/ee76d08d-3306-406d-894c-16fd3cb824d9/each-workb・・・
How to force Excel to open in a new instance by default
https://support.microsoft.com/en-us/help/3165211/how-to-force-excel-to-open-in-a-new-instance-by-def・・・
Get Multiple Excel Windows - YouTube
https://www.youtube.com/watch?v=-DeCPJVB7jY
https://www.youtube.com/watch?v=-DeCPJVB7jY
[SOLVED] I can't open two excel documents in separate windows ...
https://community.spiceworks.com/topic/6005-i-can-t-open-two-excel-documents-in-separate-windows