There are only two resources which are specific to XTar:
Here is a copy of the resources file, XTar.ad, as supplied with XTar.
!!!! Help document !!!! XTar*helpDoc: /opt/xtar-1.5b/docs/index.html !!! Some window dimensions !!! XTar*TarWindow.width: 770 XTar*TarWindow.height: 600 XTar*FileForm.width: 770 XTar*FileForm.height: 640 XTar*HelpForm.width: 770 XTar*HelpForm.height: 640 XTar*AboutForm.width: 590 XTar*AboutForm.height: 220 !!!! Fonts !!!! XTar*fontList: -adobe-helvetica-medium-r-normal--14-*-*-*-*-*-iso8859-1 XTar*FileList.fontList: -adobe-courier-medium-r-normal-*-14-*-*-*-*-*-iso8859-1 XTar*XmText.fontList: -adobe-courier-medium-r-normal-*-14-*-*-*-*-*-iso8859-1 !!!! Titles & icon name !!!! XTar*title: XTar V1.5b XTar*iconName: XTar V1.5b !!!! Colours definitions !!!! XTar*background: Grey75 XTar*foreground: Black XTar*XmRowColumn.background: #9F009B00BF00 XTar*XmCascadeButton.background:#9F009B00BF00 !!!! ToggleButton options !!!! XTar*XmToggleButton*visibleWhenOff:True XTar*XmToggleButton*indicatorSize:12 XTar*XmToggleButton*fillOnSelect:True XTar*XmToggleButton*selectColor:Red XTar*Set Attributes0*set:True XTar*Set Attributes1*set:True XTar*XTar7*set:False !!!! Translations !!!! XTar*FileList*Translations: #override \n<Key>n: next()\n\ <Key>/: search() !!!! Mappings !!!! XTar*mappings: .gif xv %s\n\ .jpg xv %s\n\ .tif xv %s\n\ .tiff xv %s\n\ .pbm xv %s\n\ .ppm xv %s\n\ .pnm xv %s\n\ .pgm xv %s\n\ .xbm xv %s\n\ .bm xv %s\n\ .xwd xwud -n %s\n\ .htm netscape %s\n\ .html netscape %s\n\ .mpg mpeg_play %s\n\ .mpeg mpeg_play %s\n\ .ps ghostview %s\n\ .dvi xdvi %s