VSTX files are mainly associated with one of the components of Microsoft Office called Microsoft Visio. It is an application for creating diagrams and diagrams. VSTX files are used to store templates on the basis of which you can create ready-made projects in the program. This allows you to create projects faster. However, you should choose a template that corresponds to the structure of the expected final project.

VSTX files are used in Microsoft Visio version 2013, and ready-made diagrams and diagrams are stored in VSDX files as vector graphics.