I changed the name of a model to see what would happen.
I typed glest into the shell to start it. It worked until it tried to load the file after I pushed the "play now" button. It crashed and displayed the message "Error opening 3d model file
Segmentation fault", in the shell.
I think a better way to handle this would be to display a message within the game saying "Error opening 3d model file: " then the file and asking if the player would like to continue.