This article explains the different formats that use the DRF file extension. It also explains how to open or convert each type.

A file with the DRF file extension is a VIZ render file, where DRF stands for Discreet Render Format. These types of files are created using the VIZ Render rendering application, which was bundled with older versions of AutoCAD Architectural software.

Some files that use this extension are Dynojet Run files, which store information about a vehicle from a diagnostic test. This data can include temperature, pressure, model data, etc.

Delphi source files use the same file extension, but for temporary files used while building software programs in the Delphi application.