Word Document (Office Open XML) (.docx)
Word processing document · MIME: application/vnd.openxmlformats-officedocument.wordprocessingml.document · Category: Document
What is Word Document (Office Open XML)?
A document format used for: Word processing document. The facts below are drawn from the FileFixPro format dataset, retrieved 2026-08-29.
| Extension | .docx |
| Full name | Word Document (Office Open XML) |
| MIME type | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| Category | Document |
| Purpose | Word processing document |
Specifications for .docx are maintained by the relevant standards body or the format's originating vendor. FileFixPro summarizes the format from general public knowledge of the format family; we do not republish proprietary specification text. See the Spec & MIME section for authoritative sources (retrieved 2026-08-29).
Official spec & structure
The authoritative definition of .docx is maintained by its standards body or originating vendor. The references below are real official sources, retrieved 2026-08-29. Where FileFixPro has not independently verified a specific URL, we mark it verify-locally rather than guess.
| MIME type | application/vnd.openxmlformats-officedocument.wordprocessingml.document |
| IANA registration | Not in the IANA Media Types registry (vendor/format-defined) |
| Structure | DOCX is a ZIP package of XML parts (Office Open XML / OOXML). The document text lives in word/document.xml; styles, media and relationships are separate parts. Defined by ECMA-376 / ISO/IEC 29500. |
Official specification sources
Source set retrieved 2026-08-29. FileFixPro does not host or mirror proprietary specification text; links point to the originating authority.
Common corruption & repair
When Word Document (Office Open XML) typically corrupts
Won't open in Word
Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
Content appears as garbage/corrupted
Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
File size suddenly near zero
Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
Step-by-step recovery path
- Identify the exact symptom. Note what happens when you open the file — won’t open, partial content, garbled characters, or a wrong-extension mismatch. The symptom drives the next step.
- Make a read-only backup first. Copy the original file to a safe location before any fix attempt, so you can retry if an approach makes things worse.
- Try the source app’s open/repair. Reopen the file in the program that created it (or a compatible one) and use its Open-and-Repair or Save-As option, which often rebuilds a damaged header.
- Apply the format-specific recovery steps. Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
- Use a conversion path as a fallback. If repair fails, convert the format using the in-browser converters linked in the Tools section, then re-open the result.
When recovery is not possible
No software can recover a file that has been overwritten or truncated to zero bytes, a container whose core structure is physically destroyed, or a file that is DRM- or password-encrypted without the key (for example DRM-locked WMA or M4V). In those cases, stop writing to the storage medium, restore from a backup or version history, and — for the only copy of something critical — consider a professional data-recovery service. The steps above are general troubleshooting, not a guarantee of recovery.
Recovery decision tool
Always work on a copy. Steps are ordered from safest to deepest.
My recovery plan — Word Document (Office Open XML) (.docx)
- 1. Stop using the file. Make a working copy — never repair the original.
- 2. Start with the app's built-in repair (Open and Repair / recover), then try a second app, then a dedicated recovery tool.
- 3. Follow the recovery path for Word Document (Office Open XML): Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
- 4. Verify the repaired copy opens and the content is complete before deleting anything.
Format-specific guidance: Use Word's Open and Repair; unzip the file and validate document.xml; restore from the temporary Word backup (ASD) or cloud version history.
Generated at FileFixPro · 2026-09-13
Compare with similar formats
These formats are linked from the FileFixPro dataset as related or same-category neighbors. Open any to see its own spec, repair and conversion path.
.doc
Word Document (Legacy)
Document
Format overview →PDF Document
Document
Format overview →.odt
OpenDocument Text
Document
Format overview →.rtf
Rich Text Format
Document
Format overview →.txt
Plain Text
Document
Format overview →.dotx
Word Template
Document
Format overview →.md
Markdown
Document
Format overview →.epub
EPUB E-book
Document
Format overview →Repair & convert Word Document (Office Open XML)
Use a FileFixPro tool that actually exists for this format. Repair tools diagnose or recover the file on your device; converters change the container. Nothing is uploaded.
Repair / diagnose this format
Office Document Structure Check
Runs 100% in your browser — no upload.
Open tool →File Structure Pre-Check
Runs 100% in your browser — no upload.
Open tool →File Extension Fixer
Runs 100% in your browser — no upload.
Open tool →Related formats you can convert to/from
Sources & attribution
- Format facts (extension, name, MIME, category, purpose, issues, recovery, conversion, related formats) from the FileFixPro format dataset, retrieved 2026-08-29.
- Official specification references in the Spec & MIME section point to IANA, the relevant standards body, or the originating vendor; retrieved 2026-08-29. Unverified items are marked verify-locally.
- Recovery guidance is general troubleshooting — it does not guarantee file recovery, and it is not an endorsement of any specific software.
How this format page is built (spec, repair & links)
Each format page lists the failure modes and recovery steps stored in the FileFixPro format dataset for that extension, plus an official-spec section that links to IANA or the format's standards body/vendor (retrieved 2026-08-29). The interactive recovery decision tool combines your selected symptom and file importance into a graded plan and runs entirely in your browser. Per-format version lineage and unverified spec URLs are intentionally omitted to avoid presenting invented facts — items we have not independently confirmed are marked verify-locally.