DOCX File Extension
Have a problem opening a .DOCX file? We collect information about file formats and can explain what DOCX files are. Additionally we recommend software suitable for opening or converting such files.
What is the .DOCX file type?
The DOCX file extension is assigned to commercial, personal or academic documents created with Microsoft Office software. This format was introduced in 2007 and replaced the previously used .doc extension. That additional "x" at the end signifies an XML file: a DOCX document represents a group of XML files in a compressed zip package while a DOC file stores data in a binary format.
Opening a .docx document can become a real problem for people who don't have one of the latest versions of Microsoft Office (from version 2007 and above) - old MS Office applications can't work with files saved with a .docx extension. To fix this compatibility issue, you can use free tools to convert your documents into another file format.
Even though the DOCX file format is mainly used and developed by Microsoft, it doesn't belong to that corporation - the documentation of this standard was initially controlled by Ecma International and later by ISO/IEC. Any open-source software application capable of XML support can open and read .docx documents.
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