Now hidden files are ignored :). Fixes #166.

src/NzbDrone.Core/RootFolders/RootFolderService.cs

@@ -149,9 +149,13 @@ namespace NzbDrone.Core.RootFolders
             foreach (string unmappedFolder in unmappedFolders)
             {
                 var di = new DirectoryInfo(unmappedFolder.Normalize());
+                if (!di.Attributes.HasFlag(FileAttributes.System) && !di.Attributes.HasFlag(FileAttributes.Hidden))
+                {
                     results.Add(new UnmappedFolder { Name = di.Name, Path = di.FullName });
                 }
 
+            }
+
             var setToRemove = SpecialFolders;
             results.RemoveAll(x => setToRemove.Contains(new DirectoryInfo(x.Path.ToLowerInvariant()).Name));