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Get "The specified package is invalid. The main part is missing" from WordProcessingDocument.Open()

I have two files: One is original file and another is Save As version from the original file.

Original get error at WordprocessingDocument.Open. Save As version is able to process normally.

I compared two files xml but nothing suspicious found.

The path and fileName is valid but it will hit error. 

using (var wordDoc = WordprocessingDocument.Open(path + "/" + fileName, true))

“The specified package is invalid. The main part is missing.”

Cindy Meister
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Yin How
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1 Answers1

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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

KeDaR
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