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Config File
From BZFlagWiki
BZFlag uses an ASCII configuration file to store user settings. The file is called "config.cfg" and its location is dependant on your operating system.
Windows
My Documents\My BZFlag Files\2.0\config.cfg
Mac OS X
~/Library/Application Support/BZFlag/2.0/config.cfg
Linux and unix platforms
~/.bzf/2.0/config.cfg