I think this could be done with a script, but I'm afraid I don't have time to write it at the moment.
For each file, you'd do something like:
Code:
ac3d load_file $filename
ac3d set_col $your_new_col
ac3d set_current_object_name $filename
You'll need to know some tcl for this. You could add a simple UI with directory selector etc.
Andy