VSD (Microsoft Visio)

The VSD format is the official file format used by Microsoft Visio, an application specializing in creating floor plans, flow charts, organization charts, and other vector-based charts.

The format has been around since the early 1990's, and like other Microsoft applications, files have evolved over the years. VSD files can be opened in Microsoft Visio, and many other vector-based programs offer support for importing VSD files for editing.