Not sure if it is meant to be opened?
They're not like .jpg or .mp3 etc.
Never used a .drv file with anything astro related, but when I have come across a .drv file it has usually been the driver itself, that is, an application will look for the .drv so it knows how to control some hardware.
I would try putting the .drv file into the root directory of the control application, it should then find it automatically next it is started?
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