The gdefaults2 file is usually located inside the .crossfire directory.
This file applies to the new gtk-2 client for crossfire,
The older gtk-1 client used the gdefaults file as configuration file.

This configuration file does not exist in a fresh installation of the client.
This file gets created by pressing the 'Save' button in the client configuration sub window
found under Menubar > Client > Configure .

At the top of the file one reads :

# crossfire-client-gtk2 automatically generates this file.
# Manual editing is allowed, but the client may be a bit
# finicky about the keys and values.  Comparisons are case
# sensitive.  'True' and 'False' are the proper case, but
# have been replaced with 1 and 0 respectively.

Where the part 'True' and 'False' are the proper case
once applied to the X11 cfclient configuration file defaults .

The code in function load_defaults() in file client/gtk-v2/src/config.c parses as follows :

        if (inbuf[0]=='#') continue;
        /* Skip any setting line that does not contain a colon character */
        if (!(cp=strchr(inbuf,':'))) continue;
        *cp='\0';
        cp+=2;      /* colon, space, then value */
 
        val = -1;
        if (isdigit(*cp)) val=atoi(cp);
        else if (!strcmp(cp,"True")) val = TRUE;
        else if (!strcmp(cp,"False")) val = FALSE;

Meaning, that lines starting with # are ignored,
lines need to contain a colon : or are ignored,
and may have any content, but digits *not* -1 ,
and still recognizes True or False in case sensitive string comparison.

See also the gtk-1 gdefaults configfile, since the gdefaults2 does not differ much.

• auto_apply_container: < 0 | 1 >
• cacheimages: < 0 | 1 >
• command_window: < 0 | 1 >
• darkness: < 0 | 1 >
• displaymode: < 0 | 1 | 2 > CFG_DM_PIXMAP , CFG_DM_SDL , CFG_DM_OPENGL
• download_all_images: < 0 | 1 >
• echo_bindings: < 0 | 1 >
• faceset:
• fasttcpsend: < 0 | 1 >
• fog_of_war: < 0 | 1 >
• foodbeep: < 0 | 1 >
• grad_color_bars: < 0 | 1 >
• iconscale: < >
• lighting: < 0 | 1 >
• map_height: < >
• mapscale: < >
• mapscroll: < 0 | 1 >
• map_width: < >
• message_timestamping: < 0 | 1 >
• nosplash: < 0 | 1 >
• popups: < 0 | 1 >
• port: < >
• resistances: < >
• server: < >
• show_grid: < 0 | 1 >
• showicon: < 0 | 1 >
• sign_popups: < 0 | 1 >
• smoothing: < 0 | 1 >
• sound: < 0 | 1 >
• split: < 0 | 1 >
• splitinfo: < 0 | 1 >
• theme: < 0 | 1 >
• tooltips: < 0 | 1 >
• trim_info_window: < 0 | 1 >
• window_layout: < >

Range:
Default: 1
Menu Entry:

Range:
Default: 0
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 10
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: 1
Menu Entry:

Range:
Default: 0
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 0
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 0
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: (null)
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 1
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: 1
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 0
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: 0
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: 100 , until version 1.11.0 '90'
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 1
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 25 , until version 1.11.0 '15'
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 100 , until version 1.11.0 '90'
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 1
Menu Entry:

Range:
Default: 25 , until version 1.11.0 '15'
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 0
Menu Entry:

Range:
Default: 1
Menu Entry:

Range:
Default: 0
Menu Entry:

Range:
Default:
Menu Entry:

Range:
Default: 0
Menu Entry:

Range:
Default: (null)
Menu Entry:

Range:
Default: 0
Menu Entry:

Range:
Default: 0
Menu Entry:

Range:
Default: 1
Menu Entry:

Range:
Default: 0
Menu Entry: (Old) Client > Configure > Map & Image Options

Range:
Default: 1
Menu Entry: (Old) Client > Configure > General Options

Range:
Default: 0
Menu Entry:

That leftover from the gtk-1 client does not work for the gtk-2 client.

Range:
Default: 0
Menu Entry:

That leftover from the gtk-1 client does not work for the gtk-2 client.

Range:
Default:Standard
Menu Entry: (Old) Client > Configure > Map & Image Options

Implemented since version 1.12

Range:
Default: 1
Menu Entry:

Range:
Default: 0
Menu Entry:

Range:
Default: gtk-v1.glade
Menu Entry: (Old) Client > Configure > Map & Image Options

Implemented since version 1.12