The dot at the beginning of the file name indicates that the plist in question is invisible by default. Temporarily making invisible files visible (via the Terminal command
defaults write com.apple.finder AppleShowAllFiles -bool YES; killall Finder
or one of the various third-party utilities which provide a GUI front end to that command) should make the file visible.
(To restore the invisibility of invisible files, change the YES in the above command to NO.)
