Change default VST for importing MIDI Files

Hi, does anyone know if it is possible to change the default VST to something else when importing a MIDI file in Cubase 5? My Cubase 5 has HALionOne as the default VST and sounds very good, but I would like to know if I can change HALionOne to a Roland Sound Canvas VST for instance?
I’ve searched extensively, but it seems that there’s only a thread for Cubase 8 which tells you where to change… Preferences/MIDI etc, but it doesn’t match with Cubase 5’s dialogue.
I thought it would be a very simple task, but it’s giving me a headache! Any help will be much appreciated!