/usr/share/doc/dx/help/dxall389 is in dx-doc 1:4.4.4-10build2.
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  | #!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CSeaGreen #!N  #!Rccp Customizing 
a Control Panel #!N #!EC #!N #!N This section describes the 
customization that can be done while building the Control Panel from 
the VPE window or while actually viewing the image in the 
Image window. #!N #!N The Control Panel  #!F-adobe-times-bold-r-normal--18*   Options #!EF menu 
provides several possibilities for further customizing the Panel and its interactors, 
as described in  #!Lconpop,dxall455 h Control Panel Options Menu  #!EL  . #!N #!N #!N  #!F-adobe-times-medium-i-normal--18*   Next Topic 
#!EF #!N #!N  #!Lchcpnm,dxall390 h Changing the Name of a Control Panel  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N 
 |