cannot open

  1. W

    Legacy XLSX once modified in 2011 cannot be re-openend

    We are having a problem reopening saved XLSX (as well as DOCX) files. If a legacy XLSX file (probably from Excel 2009 for Mac) is opened in Excel 2011 for Mac, modified, then saved, it become un-openable. Error message is: "Excel cannot open this file. The file format or file extension is not...

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