The .orf file extension is most commonly associated with Olympus digital cameras. The ORF files contain RAW images that have been captured by the Olympus camera. These files can be edited using a photo editing software.
The .orf file extension is also used for Descent 3 Outrage game files.
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If you have additional information about the ORF file format or software that uses files with the ORF suffix, please do get in touch - we would love hearing from you.