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A VSD Viewer is an application to open Microsoft Visio VSD files without the need for Microsoft Visio. The official Microsoft Visio 2016 Viewer is only available for PC and works only in Internet Explorer. [1] VSD viewers are useful to both PC and Mac users because it means they don't need to buy and install Microsoft Visio in order to view Visio files that someone may have sent or shared with them. Beyond opening Visio files, some VSD Viewers also allow basic and in some cases, advanced editing or annotation of VSD files.
Microsoft Visio is a diagramming and vector graphics application and is part of the Microsoft Office family. The product was first introduced in 1992, made by the Shapeware Corporation. It was acquired by Microsoft in 2000.
Internet Explorer is a series of graphical web browsers developed by Microsoft and included in the Microsoft Windows line of operating systems, starting in 1995. It was first released as part of the add-on package Plus! for Windows 95 that year. Later versions were available as free downloads, or in service packs, and included in the original equipment manufacturer (OEM) service releases of Windows 95 and later versions of Windows. The browser is discontinued, but still maintained.
Microsoft Visio 2016 Viewer uses ActiveX to allow users to open Visio drawings files with a .vsdx, .vsdm, .vsd, .vdx, .vdw, .vstx, .vstm, .vst, or .vtx extension. Internet Explorer also allows users to print the Visio files, although this is limited to the portion of the drawing displayed. Visio file formats are in binary format such as VSD or XML format such as VDX and VSDX and apply to Visio 2007, 2010, 2013 and 2016. Third-party VSD Viewers for Mac may not be able to open all types of Visio formats and users need to check with vendors first to ensure that the software can open the Visio formats they require.

ActiveX is a software framework created by Microsoft that adapts its earlier Component Object Model (COM) and Object Linking and Embedding (OLE) technologies for content downloaded from a network, particularly from the World Wide Web. Microsoft introduced ActiveX in 1996. In principle, ActiveX is not dependent on Microsoft Windows operating systems, but in practice, most ActiveX controls only run on Windows. Most also require the client to be running on an x86-based computer because ActiveX controls contain compiled code.
Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The W3C's XML 1.0 Specification and several other related specifications—all of them free open standards—define XML.