Bulk re-assignment of MIDI output

If I import a MIDI file from the internet Cubase automatically assigns the output of each track to Microsoft GS Wavetable Synth. I can’t get any sound out of GS Wavetable Synth on my system so in order to hear anything I have to assign all the outputs to the HALion GM VST. Some of my files have 25 or more tracks. Is there any way of changing all the outputs with one operation or do I have to do each one manually?

System: Cubase Elements 6.0.7 build 364 64bit
OS: Windows 7 Pro 64 bit

Soundcard: Realtek HD