I have added few custom external links to my menu and they all link to 1 website but with a few subfolders, so the urls look pretty much like this:

website.co.uk/web1/web2/web3/folder1\folder2\folder3

It does not seem to work for me as wordpress changes my site url every time when I click on it to something like this:

website.co.uk/web1/web2/web3/folder1folder2folder3 

(so it removes back slashes from the url)

Of course the website opens but there is no content because such a folder does not exist.

Does anyone know a solution to this little problem?