Is not as simple: by using a file tracking utility, is possible to monitor which files are being opened, but that doesn't mean the content is actually *read*
And, it's quite funny that, by using such utilities, one can find that Flight sim sometimes open .BGLs that can be entirely unrelated to the area flown (even thousand of miles apart), which means an addon scenery that never had anything to do with Hawaii, could still affect it.
I find much easier to reinstall Flight sim, then trying to hunt such things.