Cross reference VST instruments to projects

I have written dozens of songs with various plug-ins, and if I move to a new computer I may not have all of the old VSTs installed. How can I find out which projects use which instruments. For example, I had an instrument installed from a previous DAW and it no longer is available - which projects will I now have to fix? Things like piano and drums are OK but I had a synth called PSYN that is no longer supported.