DOCX is a well-known format for Microsoft Word documents. Introduced from 2007 with the release of Microsoft Office 2007, the structure of this new Document format was changed from plain binary to a combination of XML and binary files. Learn more about this file format here.

public static readonly WordProcessingFileType Docx

Public Shared ReadOnly Docx As WordProcessingFileType

public:
static initonly WordProcessingFileType^ Docx

static val Docx: WordProcessingFileType