VDX field Leave feedback On this page VDX field See Also VDX field Any drawing or chart created in Microsoft Visio, but saved in XML format have .VDX extension. A Visio drawing XML file is created in Visio software, which is developed by Microsoft. Learn more about this file format here. See Also class DiagramFileType Was this page helpful? Not really Yes, thanks Any additional feedback you'd like to share with us? Skip Send Please tell us how we can improve this page. Skip Send Thank you for your feedback! We value your opinion. Your feedback will help us improve our documentation.