Hello Pymol Users. I just started getting into Pymol and encountered two issues I'd like to ask about.

1. When trying to load amber topology and coordinate files that do not have the default extension, I get this error:

PyMOL>load ../Cdp_UCM.prmtop, CDP, 1, top
 ObjectMolecule: Attempting to read Amber7 topology file.
 CmdLoad: "../Cdp_UCM.prmtop" loaded as "CDP".
PyMOL>load ../Cdp_UCM.rst7, CDP, 1, rst
CmdLoad-Error: must load object topology before loading restart file!

If files have the default extension and I don't need to to specify the file type, loading works fine:

PyMOL>load Cdp_UCM.top, CDP, 1
 ObjectMolecule: Attempting to read Amber7 topology file.
 CmdLoad: "Cdp_UCM.top" loaded as "CDP".
PyMOL>load Cdp_UCM.rst, CDP, 1
 ObjectMolecule: read coordinates into state 1...
 CmdLoad: "Cdp_UCM.rst" appended into object "CDP".
 CmdLoad: 1 total states in the object.
Of course I can work around this by modifying the extensions on my files before loading, but due to compatibility issues with other scripts I'd prefer to leave the extensions I've been using heretofore.

2. When using the load_traj command is there a way to select which frames are to be loaded? For example to load only every 10th frame?

Pawel