Webdv client on Vista: Can see files, cannot upload

I am usng Vista. My web folders appear almost correctly (though only the first 10 files show up)

When dropping a file in the web folder, I get a Windows wraning "An error occurred copying some or all of the selected files".

Is there any chance to make it work properly using Vista webdav support, or is there any other workable solution ?
(I whish tio easily copy files from a desktop to Drupal File Framework system)