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.xlsx files are not opening in LibreOffice 3.4.3 in Ubuntu 11.10.

Could not open "ABC.xlsx"

Archive type not supported.

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It was a bug and a fix has already been released. Just upgrading will work fine. – Oxwivi Oct 22 '11 at 10:22
up vote 7 down vote accepted

You’ll need to right-click the .xlsx file, and select Properties. Then, go to the “Open With” tab, and select LibreOffice Calc from there. Click the button that says “Set As Default” to always open that file type (.xlsx) with LibreOffice Calc.

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thanks, it worked for me – Deepak Rajput Oct 17 '11 at 10:43

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