/etc/X11/xview/text_extras_menu is in xviewg 3.2p1.4-28.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34  | #	@(#)text_extras_menu 1.6 88/02/08 SMI
#
#	Copyright (c) 1987 by Sun Microsystems, Inc.
#
#	Text "Extras" menu
#
"Format"		fmt
"Capitalize"		MENU
	"abcd -> ABCD"	capitalize -u
	"ABCD -> abcd"	capitalize -l
	"abcd -> Abcd"	capitalize -c
"Capitalize"		END
"Shift Lines"		MENU
	"Right"	shift_lines -t 1
	"Left"	shift_lines -t -1
"Shift Lines"		END
"Pretty-print C"	indent -st
"Insert Brackets"	MENU
	" ( )"	insert_brackets ( )
	" [ ]"	insert_brackets \[ \]
	" { }"	insert_brackets { }
	"`` ''"	insert_brackets \" \"
"Insert Brackets"	END
"Remove Brackets"	MENU
	" ( )"	remove_brackets ( )
	" [ ]"	remove_brackets \[ \]
	" { }"	remove_brackets { }
	"`` ''"	remove_brackets \" \"
"Remove Brackets"	END
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