Portable Document Format (PDF) is a type of document created by Adobe back in 1990s. The purpose of this file format was to introduce a standard for representation of documents and other reference material in a format that is independent of application software, hardware as well as Operating System. PDF files can be opened in Adobe Acrobat Reader/Writer as well in most modern browsers like Chrome, Safari, Firefox via extensions/plug-ins.
RVM data files are related to AVEVA PDMS. RVM file is an AVEVA Plant Design Management System Model. AVEVA's Plant Design Management System (PDMS) is the most popular 3D design system using data-centric technology for managing projects.