Ok, answering myself. Turns out MOLMOL opens XYZ files. So I wrote a little program in Python that converts PDB files saved by XPLOR to XYZ format.
Briefly XYZ format has number of atoms in first line, comment on the second line and remaining lines are
<atom name=""> <x coor=""> <y coor=""> <z coor="">
No residue numbers go into XYZ file, so it will be impossible to make selections by residues. Maybe I'll fix up the script above to create selection statements too... If that happens I'll post an update here.