A free WebDAV client for Windows?
Solution 1:
I use http://www.anyclient.com/ for all my WebDav transactions and have had no issues...
Solution 2:
Bitkinex works great. (http://www.bitkinex.com)
And for mapping WebDAV as a drive you can use the free client from http://www.cloudsafe.com (https://secure.cloudsafe.com/pages/topics_cloudsafeclient.html)
Solution 3:
Have you tried WinSCP or http://www.bitkinex.com/
What about wget?
Incidentally, what's wrong with Explorer?