The file extension .VSDX refers to Microsoft Visio drawing format. This file type replaced the older vsd format for the Visio software. The file is used to store the data of technical drawings and diagrams.

Several IT operations which involve Requirment gathering and analysis, use such files to store technical drawings. The ability to draw flow charts and process diagrams on plain canvas makes visio file format a very popular file type to store such details. The file structure is known to use the Open packaging contents and also allows the end users to draw full fledge UML diagrams.