Cannot Open Externally-Generated XLS File
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The Beginner's Guide to Microsoft Excel Online
![Fixed]Excel 2016 Won't Open XLS Files](https://cdn-cmlep.nitrocdn.com/DLSjJVyzoVcUgUSBlgyEUoGMDKLbWXQr/assets/images/optimized/rev-ebc086c/blog/wp-content/uploads/2020/07/7.jpg "Fixed]Excel 2016 Won't Open XLS Files")
Fixed]Excel 2016 Won't Open XLS Files
Best Fixes to 'Excel Cannot Open the File Error Because the File Format or File Extension
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![Fixed]Excel 2016 Won't Open XLS Files](https://www.stellarinfo.com/blog/wp-content/uploads/2020/07/4-1.jpg "Fixed]Excel 2016 Won't Open XLS Files")
Fixed]Excel 2016 Won't Open XLS Files
![FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS](https://www.easeus.com/images/en/data-recovery/drw-pro/fix-excel-cannot-open-the-file.png "FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS")
FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS
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![Fixed]Excel 2016 Won't Open XLS Files](https://www.stellarinfo.com/blog/wp-content/uploads/2020/07/2.jpg "Fixed]Excel 2016 Won't Open XLS Files")
Fixed]Excel 2016 Won't Open XLS Files
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FIX: Excel 2016 Won't Open XLS Files - AvoidErrors
![Fixed]Excel 2016 Won't Open XLS Files](https://www.stellarinfo.com/blog/wp-content/uploads/2020/07/1-4-1024x540.jpg "Fixed]Excel 2016 Won't Open XLS Files")
Fixed]Excel 2016 Won't Open XLS Files
![FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS](https://www.easeus.com/images/en/data-recovery/drw-pro/excel-cannot-open-the-file.png "FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS")
FIXED] Excel Cannot Open the File Because The Extension Is Not Valid - EaseUS
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Excel Viewer can't open .xlsx file that contains a cell with a "comment" attached to it
