The .drg file extension is most commonly used by the I-Doser brainwave synchronization software. This software is used for mood enhancement purposes. The DRG files contain stereo audio tracks that are recorded using the binaural recording techniques used by the software. The DRG files also contain information about the "dose" file and a screenshot image.
The .drg file extension is also used for AllyCAD CAD design drawing files, AviSys bird watcher database files, Dyno2000 car design files and VLBI and Tied Array drudge tasking document files.
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If you have additional information about the DRG file format or software that uses files with the DRG suffix, please do get in touch - we would love hearing from you.