You’re looking at a file in Windows Explorer and it has the following details: DRV - Device Driver. What’s that mean? It means that it’s a driver file for one of your devices, such as a mouse, monitor, modem, network card, or anything else that is attached to your computer, or can be attached to it.
The device driver file contains instructions and parameters that tell the operating system how to communicate with and how to use that particular piece of equipment. You shouldn’t try to open device driver files from unknown sources, since they’ve been known to contain viruses.