This article explains what an RVT file is and how to open or convert it on your computer.
How to Convert Revit File to Older Version
A file with the file extension .RVT is a project file used by Autodesk's Revit Building Information Modeling (BIM) program.
An RVT file contains all architectural details related to the design, such as a 3D model, elevation details, floor plans, and project settings.
Autodesk's Revit program is used to create RVT files, so it can also open files in this format. If you don't have that software yet and you don't plan on buying it, you can still open the RVT file for free with the Revit 30-day trial version.