DOCX is a file extension of the Office Open XML (OOXML) document format. OOXML documents are zipped, XML-based file formats developed by Microsoft for representing a variety of office suite types of documents.

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What does X denotes in ASPX, DOCX, XLSX, PPTX etc?

Previously there were ASP, DOC, XLS, PPT etc and now ASPX, DOCX, XLSX, PPTX respectively. What does X denotes in ASPX, DOCX, XLSX, PPTX etc?
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How can I unlock a Microsoft .docx document?

I have a Microsoft .docx document that is locked down and can't even be viewed without the forgotten password. I'm wondering if there is an easy way to unlock it or get the computer to remember the ...