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How to Repair a Corrupted Excel Workbook
An Excel file may be inaccessible due to a disk or network error, even though it isn't corrupted. In such cases, Excel won't ...
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Excel cannot open the file because the file format or extension is not valid
The error in Excel can be fixed by any one of the following 3 methods described below. Hit the File tab and scroll down to the Open option. Select the Browse button ...