Files with .vsx extension refer to stencils that consist of drawings and shapes that are used for creating diagrams in Microsoft Visio. VSX files are saved in XML file format and was supported till Visio 2013. These are different than the primary VSDX file format that was introduced with Microsoft Visio 2013. VSX files can be opened in any text editor to view the contents. VSX files can be converted to several different file formats such as PDF and HTML.
VSX File Format
A sample VSX file opened in XML editor is as shown below. A typical VSX file has the following nodes as observed from its XML representation.
Some of the elements contained in the Document Properties section are as follow:
The StyleSheets node contains information about the style sheets used in the document. Each style sheet can have information about style properties, lines, fill patterns, text blocks and other such elements.
The DocumentSheet node contains information about the document properties and User name information, and look as follow: