Yeah it is a windows program. Going to other versions can be harder, though. Look at http://dvdpro.club.st/firmware/BENQ_FW.htm for a quite complete version history. If you want to B7T9, there was some trickery. Search the forum and you will find that.
Some caution when flashing:
1) no disc in drive
2) some say run Windoze in safe mode. I never did, but some recommend it.
3) Stop all windows software like DriveSpeed, InCD and so on. Do not run any windows software at all when flashing. It is good practice to do this anyway. Best would be if no background processes run and your system tray is nearly empty.
4) Do not do that at times of day when there is a high risk of power failures If you own a UPS, connect it!
Dont know how to revive this drive, for MediaTek drives it is possible, but never heard so regarding benq. Maybe the dos flasher will do that. Maybe not.
So, in short. Be sure nothing accesses the DVD when flashing (like "My Computer", have that one closed) and your PC does not crash when flashing. But it sounds worse than it is.