This file is indexed.

/etc/X11/app-defaults/Xmessage is in x11-utils 7.7+3build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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! $XConsortium: Xmessage.ad,v 1.3 94/07/26 20:23:17 gildea Exp $
*baseTranslations: 		#override :<Key>Return: default-exit()
*message.scrollVertical:	Always
*message.scrollHorizontal:	Never
*Command.shapeStyle:		oval
*Command.highlightThickness:	1