.DWN File Extension
File TypeFirmware Update File
What is a DWN file?
Software update file that is used to update the firmware of a hardware device, such as a router, modem, or graphics card; typically accessed by the hardware's associated setup program.
Since DWN files are referenced by a hardware setup program, they should not be opened manually. Instead, the file should be selected within the setup program at the beginning of the update process.