[Libreoffice-bugs] [Bug 144431] New: Calc files saved as .xlsx cannot be opened by Excel 365

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=144431

            Bug ID: 144431
           Summary: Calc files saved as .xlsx cannot be opened by Excel
                    365
           Product: LibreOffice
           Version: 7.1.6.2 release
          Hardware: x86-64 (AMD64)
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rogerparadise7 at gmail.com

I just installed Excel from Microsoft 365. I have several .xlsx files created
with LibreOffice Calc, using version 7.0.6 and 7.1.6. When I try to open these
files in Excel, it says they are corrupt and will not allow opening. If I
rename a file extension to .xls and try opening again in Excel, it says it may
be corrupt and asks if I want to open it anyway and then lets me open it. If I
rename the file extension to .ods, Excel is able to open it with no errors.

To sum up, for the following Calc created files:
.xlsx - Excel gives an error and cannot open
.xls - Excel gives an error and then allows opening
.ods - Excel opens without any problem

Obviously this is a problem for sharing spreadsheet files between a mix of 
LibreOffice and Excel users.

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