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DOCX (Office Open XML) file format

.docx · .xlsx · .pptx  ·  package (ZIP variant)  ·  introduced 2007 by Microsoft

What is a DOCX (Office Open XML) file?

Modern Microsoft Office files (.docx, .xlsx, .pptx) are ZIP archives containing XML and embedded media. You can rename a .docx to .zip and inspect its contents. The XML schemas are standardized as ECMA-376 / ISO/IEC 29500, making Office Open XML one of the most widely used ZIP-based formats on Earth.

Most readers reach this page after double-clicking a .docx file and finding their operating system unsure what to do with it. The good news: DOCX (Office Open XML) is a well-understood format with mature tooling on every major platform. It is supported in one click by mainstream archivers on Windows, macOS, and Linux.

How to extract a DOCX (Office Open XML) file

Opening a .docx file is straightforward on every modern operating system. The exact steps depend on which platform you are on:

On Windows

  1. Locate the .docx file in File Explorer.
  2. Right-click the file. If you have 7-Zip installed, choose 7-Zip → Extract Here. On Windows 11 the built-in extractor handles ZIP, 7z, RAR and several other formats directly through Extract All…
  3. If prompted, pick a destination folder and click Extract.
  4. The extracted files appear in a folder next to the original archive.

On macOS

  1. Find the .docx file in Finder.
  2. Install The Unarchiver from the Mac App Store, or Keka for both creating and extracting.
  3. Right-click the file → Open With → The Unarchiver (or just double-click after Unarchiver is set as the default).
  4. The extracted folder appears next to the archive.

On Linux

  1. Use your file manager: right-click the archive → Extract Here (file-roller on GNOME, Ark on KDE).
  2. On the command line, run one of: 
    7z x archive.docx    # works for almost any format
  3. The files appear in the current directory.

How to create a DOCX (Office Open XML) file

To pack files into a .docx archive, you typically need an archiver that supports writing this format. Not every tool can create every format — for example, only WinRAR can create real RAR files. The sidebar lists the software known to read and write DOCX (Office Open XML).

On the command line, the canonical create command is:

# Use 7-Zip, PeaZip, or the format's reference tool to create .docx files.

If you regularly create archives at scale, a dedicated archive automation suite can wrap this command in scheduled jobs, integrity checks, and offsite replication.

Strengths

  • Open standard
  • Inspectable with any ZIP tool
  • Diff-friendly text format underneath

Weaknesses and limitations

  • Standard is enormous
  • Microsoft and LibreOffice render edge cases differently

Typical use cases

  • Microsoft Office documents
  • Cross-suite document interchange

Technical details

DOCX (Office Open XML) uses the ZIP + XML algorithm and is identified on disk by the magic byte sequence 50 4B 03 04. The standard MIME type is application/vnd.openxmlformats-officedocument.wordprocessingml.document. The format is an open specification and is free for any use.

Frequently asked questions

Is DOCX (Office Open XML) safe to open?

Archive files are containers — they are only as safe as what they contain. A .docx from a trusted source is fine; one received from a stranger can hold malicious executables, scripts, or files engineered to exploit bugs in your archiver. Always keep your archiver updated, and never run unknown executables that come out of an archive. A safe workflow is to extract into a sandbox and scan the contents before opening anything.

What is the maximum file size?

Modern ZIP-based formats use the ZIP64 extension to support archives larger than 4 GB and individual files larger than 4 GB, up to 16 EB in theory. Older tooling that does not understand ZIP64 will report a corruption error on such files.

Can I password-protect a DOCX (Office Open XML)?

Some archivers can wrap DOCX (Office Open XML) files in an encrypted container, but the format itself does not always include built-in encryption. Check your archiver's documentation.

How does DOCX (Office Open XML) compare to other formats?

See our format comparison pages such as ZIP vs 7z, ZIP vs RAR, and tar.gz vs tar.xz for side-by-side feature tables.

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