According to Microsoft you can File -> Save As
to type Visio 2003-2010 Drawing (*.vsd)
Reference Save a Visio file as an earlier version:
Save a Visio file as an earlier version
You can share files with people using Visio 2003 or later by saving
your diagram file in the appropriate file format.
Click the File tab.
In the side bar, click Save As.
Under Choose a location, click the option you want.
Under Choose a folder, click Browse for Additional Folders.
In the Save as type drop-down list, select Visio 2003-2010 Drawing (*.vsd).
Browse to the location where you want to save the file and click Save.
If your diagram uses features that are not available in earlier
versions of Visio, the Microsoft Visio Compatibility Checker dialog
appears and lists the features that cannot be saved, or that will look
different in the earlier format. Click Continue to save anyway, or
Cancel if you want to change the diagram and remove the advanced
features before you save it.
Applies To: Visio 2013, Visio
You can then use a number of different utilities to convert vsd
to vdx
. One example online converter is at Visio Files Conversion:
ConceptDraw Visio File Conversion is a free web service, that is
available to anyone who has a requirement to open Visio (VSD)
documents in ConceptDraw PRO.
This service was created for Mac OS users , who need to open visual
documents saved in Visio(VSD) file format.
The service converts files from Visio binary file format VSD into
Visio XML files which will then have a VDX file extension.
To use our free file conversion service you should email your .vsd
file. as attachment. Our automated Visio File Converter will convert
the file to .vdx and you will be able to view it in 15 minutes or
less.
You can even send multiple .vsd files to us, compressed in a .zip format.
Our automated service will extract and convert each file, then send the converted files back to you in the same compression format in which you originally sent them.