How to fix “The file is not in a recognized format” error when opening EXCEL(x) 2007 -2010 files. –

The following error occurred when trying to open user-created Excel workbooks on a Windows 7-based computer with Office 2003 (Pro) and the “Microsoft Office Compatibility Pack for New Versions of Word, Excel, and PowerPoint File Formats” already installed. in the new office 2007 or 2010 versions (*.xlsx): “The (Excel) file is not in an unrecognizable format….”. Uninstalling and reinstalling the MS Office compatibility suite did not resolve the issue. Finally, after some searching, the following solution fixed Excel’s “unrecognized format” error message:

How to fix “The file is not in an unrecognizable format” error message in Excel.

1. Right click in any “.xlsx” file (eg ‘Book1.xlsx’) and go to “Open with” > “Select the default program“.

2. Yes Open with in the dialog box, clickReview“.


3. Go to “C:\Program Files\Microsoft Office\Office12“, to select “Moc.exe” * file and click “OK“.

* MOC = Microsoft Open XML Converter.


4. Now “open.xlsx” workbook. Your problem should disappear!

That’s it!

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