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Excel compatibility issues

I'm having issues with a work colleague who is not able to open the attached excel spreadsheet.  I am using Excel 2007 and he is using excel 2003.  However, the file (which contains macros) is saved in 2003 compatibility format.

Yet even when I open it, I get a warning "The file you are trying to open "[File Name].xls" is in a different format than specified by the file extension.  Verify that the file is not corrupted and is from a trusted source before opening the file.  Do you want to open the file?"

When I click yes, it opens fine.  When my colleague opens it, it opens as jibberish/garble.

Microsoft Excel

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8/22/2022 - Mon
Saqib Husain

I suggest you open the file, save it again and then try sending it to the colleague.
Saqib Husain

Or "Save as" with a different name but the same extension.

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Thanks.  Yes it was the maco.  works fine when i rename or save file as xls rather than xlsx.
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