BLI files are part of the firmware package of Thomson's Speedtouch Series WLAN modems and routers; BLI files contain firmware updates for Speedtouch devices and may, according to the update version, add features, repair bugs and perform other miscellaneous tasks. Installation of firmware updates for Thomson's Speedtouch Series WLAN modems and routers range can be carried out using a web management interface provided by Thomson.
The BLI file extension is associated with the BLISS-10 programming language for PDP-10 mainframe computers manufactured by Digital Equipment Corporation (DEC). The .bli file stores compiler sources. The PDP-10 was a mainframe computer manufactured by Digital Equipment Corporation (DEC) from the late 1960s on; the name stands for "Programmed Data Processor model 10". It was the machine that made time-sharing common; it looms large in hacker folklore because of its adoption in the 1970s by many university computing facilities and research labs, the most notable of which were MIT's AI Lab and Project MAC, Stanford's SAIL, Computer Center Corporation (CCC), and Carnegie Mellon University.