ADDITION TO SOLVED:
Tthat the file gssetgs.bat may say gswin32.exe
If you have 64bit windows, like everyone else in the world, you installed the 54 bit version of ghostscript.
If you edit gssetgs.bat AS ADMINISTRATOR and change the 32 to 64, then inkscape can open the ps files.
ADDITION TO SOLVED:
Tthat the file gssetgs.bat may say gswin32.exe
If you have 64bit windows, like everyone else
in the world, you installed
the 54 bit version of ghostscript.
If you edit gssetgs.bat AS ADMINISTRATOR
and change the 32 to 64, then inkscape can open the ps files.