Excel cannot open the file 'ABCDE.xlsx' because the file format or file extension is not valid" when use "Reports - Run" ... "Save"
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✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]
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![Solved] Excel Cannot Open the File Because the Extension Is Not Valid](https://www.stellarinfo.com/blog/wp-content/uploads/2021/06/excel-cannot-open-the-file-extension-not-valid-error-1.png "Solved] Excel Cannot Open the File Because the Extension Is Not Valid")
Solved] Excel Cannot Open the File Because the Extension Is Not Valid
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![✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]](https://www.easeus.com/images/en/data-recovery/drw-pro/excel-cannot-open-the-file.png "✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]")
✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]
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![✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]](https://www.easeus.com/images/en/data-recovery/drw-pro/excel-cannot-open-the-file-7.png "✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]")
✓Excel Cannot Open the File Because the Extension Is Not Valid [Windows & Mac Solutions]
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Solved: Excel Cannot Open the File Because the Extension Is Not Valid
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Fix: Excel Cannot Open The File Because The File Format Or File Extension Is Not Valid
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