~/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys/
I tried that path but there doesn't appear to be anything Macromedia. I did a Spotlight search and it said there is a Macromedia folder in the Internet Plug-Ins folder.
But, when I looked there…no Macromedia folder.
I tried the same search after using Cocktail to Show Invisibles, but no luck.
Note: The Flash Plug-In is disabled.