Same here. I'm also concerned because I got a pop-up saying my Flash Player was out of date. I cancelled that window and went to the System Preferences app (MacOSX 10.6.8) and used the Flash Player pref pane to see if I needed to update to a newer version by clicking "check now". Needed to update so I DL'd it from Adobe and installed.
But as mentioned by poster I quoted I also can't find the com.apple.xprotectupdater.plist file.
Never mind... operator error. I was looking in wrong Library. It's there so I'm OK.
I have to say it's annoying that a third party app is the weak spot my OS security.
Where did you find it? Still unable to locate it.....