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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
XP: C:\Documents and Settings\[user]\My Documents\My BZFlag Files\2.0\config.cfg Vista: C:\Users\[user]\Documents\My BZFlag Files\2.0config.cfg
Mac OS X
~/Library/Application Support/BZFlag/2.0/config.cfg
Linux and unix platforms
~/.bzf/2.0/config.cfg