Describes the cause and action for error messages.
Error Message(English)：
unable to save workbook
Unable to Save Workbook in Microsoft Excel | Dell 日本
https://www.dell.com/support/article/jp/ja/jpbsd1/sln308103/unable-to-save-workbook-in-microsoft-exc・・・
Unable to Save Workbook in Microsoft Excel | Dell US
https://www.dell.com/support/article/us/en/04/sln308103/unable-to-save-workbook-in-microsoft-excel
excel - Unable to save workbook in SharePoint Online / Office 365 ...
https://sharepoint.stackexchange.com/questions/173286/unable-to-save-workbook-in-sharepoint-online-o・・・
2010 - Unable to update an excel file in SP
https://sharepoint.stackexchange.com/questions/113965/unable-to-update-an-excel-file-in-sp
sharepoint foundation - How to work with Excel ...
https://sharepoint.stackexchange.com/questions/101085/how-to-work-with-excel-in-c
site - How to use ExcelServices in Sharepoint?
https://sharepoint.stackexchange.com/questions/57523/how-to-use-excelservices-in-sharepoint
Unable to Save Workbook - Microsoft
https://social.technet.microsoft.com/Forums/office/en-US/32848337-0f89-4a4a-af0f-0188d51f90e5/unable・・・
UNABLE TO SAVE WORKBOOK ? Welcome to Excel's Suggestion Box ...
https://excel.uservoice.com/forums/274580-excel-online/suggestions/36318802-unable-to-save-workbook
Protection Options - LockXLS - Workbook Copy Protection.
http://www.lockxls.com/help.asp?hid=prot_opt