What is DOCX? DOCX, short name for Document XML, is used as the file extension for files in Microsoft Word Document XML format. .DOCX files are binary files that can be opened by Microsoft Word software. See the sample .DOCX file included below.

File Extension: .DOCX

MIME Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document

File Content: Word Document

.DOCX files are document files saved in Word Document XML format. Here are the first 64 bytes of a sample .DOCX file dumped in HEX values:

50 4b 03 04 14 00 06 00 08 00 00 00 21 00 09 24 PK..............
87 82 81 01 00 00 8e 05 00 00 13 00 08 02 5b 43 ...............C
6f 6e 74 65 6e 74 5f 54 79 70 65 73 5d 2e 78 6d ontent_Types..xm
6c 20 a2 04 02 28 a0 00 02 00 00 00 00 00 00 00 l...............

.DOCX files are actually ZIP files. See the ZIP identifier "PK" in the above HEX dump. When an .DOCX file is extracted by a ZIP tool, you will these files and folers:

<DIR>          theme
           540 [Content_Types].xml
<DIR>          _rels

.DOCX Word Document XML file sample: Click sample.docx to download.

.DOCX Word Document XML files can be created and modified by these software:

• Microsoft Office - Opens and creates .DOCX Word Document XML files
• Apache OpenOffice - Opens .DOCX Word Document XML files