/usr/share/dx/samples/user/ is in dxsamples 4.2.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/dx/samples/user/Makefile_inboard_alphax
/usr/share/dx/samples/user/Makefile_inboard_aviion
/usr/share/dx/samples/user/Makefile_inboard_hp700
/usr/share/dx/samples/user/Makefile_inboard_ibm6000
/usr/share/dx/samples/user/Makefile_inboard_ibmpvs
/usr/share/dx/samples/user/Makefile_inboard_intelnt
/usr/share/dx/samples/user/Makefile_inboard_sgi
/usr/share/dx/samples/user/Makefile_inboard_solaris
/usr/share/dx/samples/user/Makefile_inboard_sun4
/usr/share/dx/samples/user/Makefile_intelnt
/usr/share/dx/samples/user/Makefile_loadable_alphax
/usr/share/dx/samples/user/Makefile_loadable_hp700
/usr/share/dx/samples/user/Makefile_loadable_ibm6000
/usr/share/dx/samples/user/Makefile_loadable_intelnt
/usr/share/dx/samples/user/Makefile_loadable_sgi
/usr/share/dx/samples/user/Makefile_loadable_solaris
/usr/share/dx/samples/user/Makefile_os2
/usr/share/dx/samples/user/Makefile_outboard_alphax
/usr/share/dx/samples/user/Makefile_outboard_aviion
/usr/share/dx/samples/user/Makefile_outboard_hp700
/usr/share/dx/samples/user/Makefile_outboard_ibm6000
/usr/share/dx/samples/user/Makefile_outboard_ibmpvs
/usr/share/dx/samples/user/Makefile_outboard_intelnt
/usr/share/dx/samples/user/Makefile_outboard_sgi
/usr/share/dx/samples/user/Makefile_outboard_solaris
/usr/share/dx/samples/user/Makefile_outboard_sun4
/usr/share/dx/samples/user/Readme
/usr/share/dx/samples/user/add.c
/usr/share/dx/samples/user/hello.c
/usr/share/dx/samples/user/hello_loadable.mdf
/usr/share/dx/samples/user/makex.c
/usr/share/dx/samples/user/user_inboard.mdf
/usr/share/dx/samples/user/user_loadable.mdf
/usr/share/dx/samples/user/user_outboard.mdf