Directory file list filtering

I have a menu that consists of the items in a directory.  What I NEED is to filter out a specific file.  The file that I need to NOT show up in this list is called WIPSAdmin... how do I keep that from showing up in the list?  Here is the code:

 string[] directories = Directory.GetDirectories(@"\\srvusadcweb01\wips_test");

            var validDirectories = from string directory in directories
                                   where Path.GetFileNameWithoutExtension(directory) != "WIPSDATA"
                                   select directory;

            foreach (string fileName in validDirectories)
            {
                this.Sites.Add(new Folder() { PathName = fileName });

            }