Which is not an open file format in BIM?

In the context of Building Information Modeling (BIM), an open file format is defined as a format that is publicly available and allows for interoperability among different software applications without needing proprietary access or licenses.

The chosen answer, RVT, is indeed not an open file format. RVT files are specific to Autodesk Revit, which is a proprietary software tool for BIM. This means that RVT is designed to work exclusively within the Revit environment, limiting compatibility with other software tools and platforms. Because of its proprietary nature, RVT cannot be easily shared or accessed by programs that do not support it.

In contrast, DWG, DGN, and IFC are examples of file formats that exemplify openness and interoperability. DWG is widely used for 2D and 3D drawing data and can be accessed by various applications. DGN is the file format used by MicroStation, another widely-used CAD program, and it also allows for interoperability. IFC (Industry Foundation Classes) is specifically designed as an open format for BIM data that facilitates the sharing of information among different software applications, promoting collaborative workflows in the construction industry.

Thus, RVT stands out as a proprietary format, confirming that it is not considered an open file format in BIM