A Visio Macro-Enabled Drawing (.vsdm) is a file format used by Microsoft Visio, a diagramming and vector graphics application. It's specifically designed to store drawings that contain macros, which are small programs embedded within the file to automate tasks, add functionality, or customize the user experience. These macros are written in Visual Basic for Applications (VBA). Because .vsdm files can contain executable code, they pose a potential security risk if opened from untrusted sources. Visio users employ .vsdm files for a wide range of diagrams, including flowcharts, network diagrams, organizational charts, floor plans, and engineering designs. The macro functionality allows for dynamic updates, interactive elements, and custom calculations within the diagrams. When sharing .vsdm files, it's crucial to ensure the recipient is aware of the macro content and trusts the source to prevent potential security breaches. Disabling macros is a common security precaution when opening files from unknown or untrusted origins. The format is based on the Open Packaging Conventions (OPC), similar to other modern Microsoft Office formats.