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/etc/X11/app-defaults/XDu is in xdu 3.0-18.

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The actual contents of the file can be viewed below.

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!
!  XDu Resources
!
!  I recommend the "-*-helvetica-bold-r-normal--14-*" font, but if
!    you don't have it, or want your server default, then change it
!    or comment it out respectively.
!  Order choices: first, last, alpha, ralpha, size, rsize
!  Color to taste.
!
!*foreground:		yellow
!*background:		blue4
!*help*foreground:	green
!*help*background:	red4
*window.Width:		600
*window.Height:		480
!*Font:			-*-helvetica-bold-r-normal--14-*
!*Ncol:			5
!*ShowSize:		true
!*Order:		first