The most frequent use of .vdx was for . Visio is a diagramming tool. These files contain flowcharts, org charts, and floor plans. They are not video files. If you have a legacy VDX file from Visio 2010 or earlier, you need a diagram viewer, not a video player. (Note: Modern Visio uses .vsdx ).
Popular on Mac but also available for Windows, Elmedia Player offers extensive codec override features.
VDX Player stands out due to its "deceptively simple" interface that hides a robust set of professional-grade features.