What Is a DRF File?

How to Open, Edit, & Convert DRF Files

Screenshot of several DRF files in Windows 10 that open with Dynojet WinPEP
DRF Files.

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

Some DRF files may instead be Dynojet Run files, which save information about a vehicle from a diagnostics test. Information in these DRF files may include temperature, pressure, model data, etc.

Delphi Resource files use the DRF file extension too. These are temporary files used while building software programs in the Delphi application.

Other uses for a DRF file may be as a Document Reference file used with the Hummingbird DOCS Open software, or possibly as a Kodak Raw image file.

How to Open a DRF File

DRF files that are VIZ Render files can be opened using Autodesk's 3ds Max. Once opened, though, I'm pretty sure you have to save it to a different format (like MAX) instead of back to DRF.

Other DRF files, like Dynojet Run files, can be opened using Dynojet's WinPEP (previously known as Dyno Run Viewer), while Delphi Resource files can be opened with Embarcadero's Delphi.

If your DRF file is associated with Hummingbird DOCS Open, it can be used with programs associated with OpenText, but I'm not sure of any specifics on which applications actually use the DRF file.

Kodak Raw image files that end in the DRF extension should be supported by the same programs that support the more common DCR extension. See What Is a DCR File? for more on that.

Note: If your DRF file doesn't open with these programs, it may mean you have a completely different file that requires a different program in order for it to open. One suggestion I usually make is to open these types of file in a text editor and see if you can find any sort of text within the file that can help you identify what program was used to create that file or what format the file is it.

Tip: You might double-check that you're not confusing the DRF file with a file that has a similar file extension. DWF and RFD (Recogniform Form Designer) files, for example, have nothing to do with DRF files even though their file extensions share some of the same letters.

If you find that an application on your PC does try to open the DRF file but it's the wrong application or if you would rather have another installed program open DRF files, see our How to Change the Default Program for a Specific File Extension guide for making that change in Windows.

How to Convert a DRF File

A DRF file may be used in a number of different circumstances, so it's best to first understand what format the file is in before you should decide how to convert it.

If any of the programs mentioned above are able to convert the DRF file, it's most likely done through the File > Save As menu or something similar, like an Export menu.

For example, 3ds Max should be able to convert via export/save DRF files to DWG, DXF, and other image formats like JPG and PDF.

However, there are some specific tools to convert DRF files if they're Kodak image files. OnlineConverer.com is one online converter that should work with this image format to convert the DRF file to JPG.

Note: Although DRF is one exception, most common file types can be converted to other formats using a free file converter tool.

More Help with DRF Files

See Get More Help for information about contacting me on social networks or via email, posting on tech support forums, and more. Let me know what kinds of problems you're having with opening or using the DRF file and I'll see what I can do to help.