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  • Try to open your file using package class. Add Reference "WindowsBase" to your project. and then use System.IO.Packaging.Package.

    that will be easier.

    check the following link:

    http://openxmldeveloper.org/articles/OpenXMLDocFromDotNet.aspx
    • Proposed as answer by sibasissinha Saturday, August 10, 2019 11:56 AM
    Monday, September 22, 2008 12:09 PM
  • I"m afraid it is because the package you're trying to open is invalid. Please make sure the package has the part of "maindocument.xml".

     

    This error may occur at this situation: the package tried to open is created by the windows context menu, then its size is 0 until you open the file and save it even without any changes in Word 2007. After open-and-save, the file should be opened correctly by the SDK.

     

    • Proposed as answer by mrdivo Tuesday, November 25, 2008 6:40 PM
    Wednesday, September 24, 2008 3:44 AM