What is the proprietary file format for Autodesk Revit?

The proprietary file format for Autodesk Revit is RVT. This format is specifically designed for use with Revit, enabling the software to store all the modeling data, including geometry, project-specific information, and other contextual elements. Using RVT files allows for the full utilization of Revit's capabilities, such as Building Information Modeling (BIM), which involves managing the design and construction process.

RVT files contain all aspects of a project, including elements such as walls, doors, windows, and even metadata about each component, making it integral to how users interact with the software. Other file formats mentioned, such as DWG, are widely used in CAD applications and serve different purposes outside of the specific BIM functions provided by Revit. While other formats like NWD (used for Navisworks) and SMC (associated with other software) exist, they do not serve as the primary models for Revit projects. Therefore, RVT is the correct answer as it directly represents the internal structure and functionality of Autodesk Revit software.