The WinFileCache.dat is only there, when Dreamweaver is not running.
So close Dreamweaver and then follow the instructions again to delete the cache-file.
I got used to clear the file cache every time before I start DW. To keep things simple, I've made a Windows shortcut to the configuration folder containing that file.
Yes I know, that's one more task before you can work with DW, but since the cache file gets corrupted very often, it's worth the effort.
Remember, that when DW quits unexpectedly, there won't be a cache file!
So to get over that problem, start DW and immediately close it again. The cache file will be recreated on that clean startup and you are ready to go.