.DFU File Extension
File Type 1iOS DFU File
What is a DFU file?
Firmware file used by iPhone and iPod devices; stores low-level system data that is used to run the device; contained within an .IPSW update file and is among other files in the IPSW archive; may stand for "Device Firmware Update" file.
File Type 2LaTeX Font Encoding File
.DFU File Association 2
File used by LaTeX, a high-quality typesetting system often used for formatting academic and journal papers; defines supported characters, such as ASCII and Unicode characters, for the LaTeX configuration.