Try opening up an explorer window and typing in %Appdata% into the file path and hitting enter.
This should take you to the Roaming directory of your AppData directory and you can navigate to the Adobe folder and then the Dreamweaver folder for the version you are using and find the configuration folder which contains the winfilecache.
note: if you are using CS4, you will have to navigate to the en_US folder before the configuration folder.