Unable to open from Mail – VSD Viewer for Visio Drawings Review

UPDATE: Okay, I received some fine support from Serg regarding this issue. It took a day or so to figure things out but turns out it was the original email I used to open the files was somehow corrupted. Anyway, I've since opened about a dozen other Visio files without any issue. Thanks again Serg! Does what it's supposed to do.
Review by TheAirbus on VSD Viewer for Visio Drawings.