This file format (also known as OOXML) is associated with newer Microsoft Office products and is implemented in files with extensions that end with x, such as .docx, .xlsx, and .pptx. At the time of writing, this is the default format used by modern versions of Office.
In this case, all information is stored in Open Packaging Convention (OPC) packages, which are actually ZIP archives that follow a particular structure and store XML and other data as well as the relationships between them.
Here is its basic structure:
- [Content_Types].xml: This file can be found in any document and stores MIME type information for various parts of the package.
- _rels: This directory contains relationships between files within the package. All files that have relationships will have a file here with the same name and a .rels extension appended to it. In addition, it also contains a separate .rels XML file for storing package relationships.
- docProps: Contains several XML files describing...