/etc/X11/app-defaults/Xditview is in x11-apps 7.7+4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*MenuButton*Font: 	-*-helvetica-bold-r-normal--*-120-*-*-*-*-iso8859-1
*SimpleMenu*Font: 	-*-helvetica-bold-r-normal--*-120-*-*-*-*-iso8859-1
*Text*Font:	-*-courier-medium-r-normal--*-120-*-*-*-*-iso8859-1
*paned.allowResize:		true
*paned.?.showGrip:		false
*paned.?.skipAdjust:		false
*paned.form.porthole.width:	600
*paned.form.porthole.height:	800
*paned.label.skipAdjust:	true
*MenuButton.shapeStyle: oval
*Command.shapeStyle: oval
*fileMenuButton.label:		File
*fileMenuButton.leftBitmap:	menu12
*fileMenuButton.menuName:	fileMenu
*fileMenu.openFile.label:	Open File
*fileMenu.revisitFile.label:	Reopen File
*fileMenu.setResolution.label:	Set Screen Resolution
*fileMenu.quit.label:		Quit
*prevButton.bitmap:		ldblarrow
*prevButton.internalHeight:	0
*prevButton.Translations: 	#override <BtnUp>: PreviousPage() unset()
*pageNumber.translations: #override\
     Ctrl<Key>J:    SetPageNumber()\n\
     Ctrl<Key>M:    SetPageNumber()\n\
     <Key>Linefeed: SetPageNumber()\n\
     <Key>Return:   SetPageNumber()\n\
     Ctrl<Key>O:    Noop()\n\
     Meta<Key>I:    Noop()\n\
     Ctrl<Key>N:    Noop()\n\
     Ctrl<Key>P:    Noop()\n\
     Ctrl<Key>Z:    Noop()\n\
     Meta<Key>Z:    Noop()\n\
     <Key>space:    NextPage()\n\
     Ctrl<Key>v:    NextPage()\n\
     Meta<Key>v:    PreviousPage()\n\
     <Key>Next:	    NextPage()\n\
     <Key>Prior:    PreviousPage()\n\
     <Key>Find:	    OpenFile()
*pageNumber*editType:	edit
*nextButton.bitmap:		rdblarrow
*nextButton.internalHeight:	0
*nextButton.translations: 	#override <BtnUp>: NextPage() unset()
*viewport.allowResize:	false
*viewport.forceBars:	true
*viewport.allowHoriz: true
*viewport.allowVert: true
*dvi.translations: #augment \
	<Btn1Down>:	XawPositionSimpleMenu(popupMenu) MenuPopup(popupMenu)\n\
	Ctrl<Key>v:	NextPage()\n\
	Meta<Key>v:	PreviousPage()\n\
	<Key>space:	NextPage()\n\
	<Key>Next:	NextPage()\n\
	<Key>Prior:	PreviousPage()\n\
	<Key>Find:	OpenFile()
*dvi.baseTranslations: #augment \
	<Btn1Down>:	XawPositionSimpleMenu(popupMenu) MenuPopup(popupMenu)\n\
	<Key>space:	NextPage()\n\
	Ctrl<Key>v:	NextPage()\n\
	Meta<Key>v:	PreviousPage()\n\
	<Key>Next:	NextPage()\n\
	<Key>Prior:	PreviousPage()\n\
	<Key>Find:	OpenFile()
*popupMenu.nextPage.label:	Next Page
*popupMenu.previousPage.label:	Previous Page
*popupMenu.setResolution.label:	Set Screen Resolution
*popupMenu.openFile.label:	Open File
*popupMenu.revisitFile.label:	Reopen File
*popupMenu.quit.label:		Quit
*promptShell.allowShellResize:	true
*promptShell.promptDialog.value.translations: #override\
	<Key>Return: Accept()
*promptShell.promptDialog.value.baseTranslations: #override\
	<Key>Return: Accept()
*promptShell.promptDialog.accept.label: Accept
*promptShell.promptDialog.accept.translations: #override\
	<BtnUp>: Accept() unset()
*promptShell.promptDialog.accept.baseTranslations: #override \
	<BtnUp>: Accept() unset()
*promptShell.promptDialog.cancel.label: Cancel
*promptShell.promptDialog.cancel.translations: #override \
	<BtnUp>: Cancel() unset()
*promptShell.promptDialog.cancel.baseTranslations: #override \
	<BtnUp>: Cancel() unset()
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