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ZDoom's
configuration file is named
zdoom-<user>.ini, where <user> is the player's username on his computer. It is frequently referred to as just
zdoom.ini or
the ini when the context is clear. On Windows system, the
.ini extension may be hidden if the default setting of letting the Explorer hide known file extensions is kept. Since ZDoom is a
portable application, the ini is stored in the same directory as where ZDoom is located, rather than in an %APPDATA% subdirectory. On Vista and newer Windows systems, this may cause problems if ZDoom is placed within the C:\Program Files hierarchy.
The -config command line parameter allows to use a different configuration file from the one used by default.