We have found one software suitable in our database for this conversion.
The only way how to convert vdx to vsd would be to use some older version of Microsoft Visio, because latest versions of Visio no longer allow saving to previously format.
Unfortunately, we do not know about any 3rd party conversion tool that would otherwise allow vdx to vsd conversion.
Updated: December 21, 2016
A diagram application, that uses vector graphics to create diagrams. Microsoft Visio is distributed as part of Microsoft Office Family and also available as a subscription through Microsoft Office 365. The latest version is Visio 2016 that is compatible with Windows 7, Windows 8 and Windows 10.