/etc/xmedconrc is in xmedcon 0.10.7-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# filename: xmedconrc                                                     #
#                                                                         #
# CONFIG File : Medical Image Conversion Utility                          #
#                                                                         #
# purpose     : the general Gtk+ resource file                            #
#                                                                         #
# project     : (X)MedCon by Erik Nolf                                    #
#                                                                         #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# $Id: xmedconrc,v 1.4 2007/11/16 22:31:27 enlf Exp $
# Note: When (X)MedCon is installed, this becomes the system wide resource
#       file. You could copy it to your ${HOME}/.xmedconrc for personal
#       configurations. Though you better keep the fixed font as fixed. 
#
# DEFAULT UNIX SETTINGS (green/yellow/gray color style)
#
     style "DefaultStyle"
     {
      #font = "-adobe-helvetica-medium-r-normal--*-120-*-*-*-*-*-*"
       font = "-*-lucida-medium-r-normal-*-12-*-*-*-*-*-iso8859-1"
       bg[NORMAL] = { 0.84, 0.84, 0.84 }
     }
     style "FixedStyle" = "DefaultStyle"
     {
      #font = "-misc-fixed-medium-r-normal--*-120-*-*-*-*-*-*"
       font = "-adobe-courier-medium-r-normal-*-*-100-*-*-*-*-*-*"
      #font = "-*-fixed-medium-r-semicondensed-*-*-120-*-*-*-*-iso8859-1"
     }
     style "Window" = "DefaultStyle"
     {
     }
     style "Button" = "DefaultStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 1.0 }
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 1.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 }
     }
     style "NormalLabel" = "DefaultStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 1.0 }
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 1.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 }
     } 
     style "BarLabel" = "FixedStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 1.0 }
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 1.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 }
     }
     style "FixedLabel" = "FixedStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 0.0 }
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 1.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 }
     }
     style "Frame" = "DefaultStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 1.0 }
     }
     style "Menu" = "DefaultStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 1.0 }
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 1.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 }
     }
     style "ToggleButton" = "FixedStyle"
     {
       fg[NORMAL] = { 0.0, 0.0, 0.0 }
       fg[ACTIVE] = { 0.0, 0.0, 0.0 }
       bg[ACTIVE] = { 0.0, 0.75, 0.0 } 
       fg[PRELIGHT] = { 1.0, 1.0, 0.0 }
       bg[PRELIGHT] = { 0.0, 0.75, 0.0 }
     }
     style "FixedText" = "FixedStyle"
     {
     }
     # These set the widget types to use the styles defined above.
     # The widget types are listed in the class hierarchy, but could probably be
     # just listed in this document for the users reference.
     widget_class "GtkWidget" style "DefaultStyle"
     widget_class "GtkWindow" style "Window"
     widget_class "GtkDialog" style "Window"
     widget_class "GtkFileSelection" style "Window"
     widget_class "*GtkCheckButton*" style "ToggleButton"
     widget_class "*GtkRadioButton*" style "ToggleButton"
     widget_class "*GtkButton*" style "Button"
     widget_class "*GtkLabel*" style "NormalLabel"
     widget_class "*GtkFrame*" style "Frame"
     widget_class "*GtkAspectFrame*" style "Frame"
     widget_class "*Menu*"  style "Menu"
     widget_class "*Selection*" style "DefaultStyle"
     widget_class "*GtkText" style "FixedText"
     widget_class "*GtkNotebook" style "DefaultStyle"
     widget "*FixedLabel*" style "FixedLabel" 
     widget "*BarLabel*"   style "BarLabel"
     widget "*GtkCheckButton*" style "ToggleButton"
     widget "*GtkRadioButton*" style "ToggleButton"
     widget "*GtkText*" style "FixedText"
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