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Config File
From BZFlagWiki
BZFlag uses a ConfigFile to store user settings.
Windows
The file is: "{{{My Documents\My BZFlag Files\2.0\config.cfg}}}"
Mac OS X
The file is: "{{{~/Library/Application Support/BZFlag/2.0/config.cfg}}}"
Linux and unix platforms
The file is: "{{{~/.bzf/2.0/config.cfg}}}"