/usr/share/doc/dx/help/dxall465 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 11 12 13 14  | #!F-adobe-helvetica-medium-r-normal--18*
#!N 
#!CDarkGreen #!N  #!Rcmapfm Colormap File Menu #!N #!EC #!N #!N #!N 
#!N The Colormap  #!F-adobe-times-bold-r-normal--18*   File #!EF menu provides the following options: 
#!N #!I0 #!N #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   New #!EF #!I50 #!N 
Replaces Colormap Editor values with default values. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   
Open... #!EF #!I50 #!N Opens an existing Colormap as specified in 
the dialog box that appears. If a current Colormap is on 
display and changes have been made, a dialog box appears for 
applying wanted changes. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   Save As... #!EF #!I50 
#!N Saves the current Colormap configuration as the name typed into 
the dialog box that appears. #!N #!I0 #!N  #!F-adobe-times-bold-r-normal--18*   Close #!EF 
#!I50 #!N Closes the Colormap window. #!I0 #!N #!N #!N #!N 
#!N  #!F-adobe-times-medium-i-normal--18*   Next Topic #!EF #!N #!N  #!Lcmapem,dxall466 h Colormap Edit Menu  #!EL  #!N  #!F-adobe-times-medium-i-normal--18*   #!N 
 |