Hi, I'm using WebDAV to copy files over the network. In the last days I have copied several thousand files with WebDAV and Vista. But now I have a problem. I can't copy a file folder with Vista. Windows Vista Explorer returns error 0x80070057. In this folder are 8 files (different sizes and file types). I tried to copy the files and then to move it to the network. I also tried to zip them and unzip them on the remote host. It was possible to move the zip package, but when I tried to unzip the files it failed again with the same error. There are some other files which are not movable. It is very bogus. The files are different. Different types, different sizes and different creation dates. All files are writeable and all files are not protected by UAC. I don't know what the problem is. It is a very strange bug. The bug is present in every WebDAV client I used. It must be a problem with Windows Vista.