Is the WebDAV UCB Provider still; working in OpenOffice 4.1.2 ?
I'm a C++ developer running OpenOffice 4.1.2 on Windows.
I am trying to open documents hosted on a WebDav server in OOO via the WebDAV UCB provider, but I am getting the following error:
"Error reading from the Internet. Server Error Message: ."
I'm using the custom UCB-enabled OpenOffice Open/Save dialogs.
I've tried all the following URL styles, but none of them appear to work:

vnd.sun.star.webdav://host:port/<path>
dav://host:port/<path>
http://host:port/<path>
Urls of the form "ftp://" and "file:///" appear to work fine.
I can access the same WebDAV server ok via CarotDAV and can see & sniff the TCP traffic from CarotDAV, but I am not seeing any TCP activity at all from OpenOffice.
Running under a debugger, I suspect it might be some form of issue between the UCB layer and the Serf library.
Is this a known issue (e.g. specific to windows) with any particular workarounds ?
Is it some form of platform-specific authentication support issue (even though I don't see any TCP traffic) ?
Is there any recent documentation explaining the appropriate URL's to use?