Describes the cause and action for error messages.
2016 not opening xlsx files
Excel cannot open the file '(filename)'.xlsx' error | Stellar KB
[FIXED] Excel Cannot Open the File Because The Extension Is Not ...
How can I open .xls file with Excel 2016? - Super User
Double-clicking an Office file fails to open it in the correct Office program
How to make Excel 2016 the default app to open xls and xlsx data ...
KB0045: Excel does not open when double-clicking an Excel file ...
3 Ways to Fix “Excel cannot open the file '(filename)'.xlsx” Error
Microsoft Excel: the file is corrupted and cannot be opened - 2016, 2013