Fixed: Only clear readonly flag when file has readonly flag

src/NzbDrone.Common/Disk/DiskProviderBase.cs

@@ -401,10 +401,15 @@ namespace NzbDrone.Common.Disk
         {
             if (File.Exists(path))
             {
-                var newAttributes = File.GetAttributes(path) & ~(FileAttributes.ReadOnly);
+                var attributes = File.GetAttributes(path);
+
+                if (attributes.HasFlag(FileAttributes.ReadOnly))
+                {
+                    var newAttributes = attributes & ~(FileAttributes.ReadOnly);
                     File.SetAttributes(path, newAttributes);
                 }
             }
+        }
 
         public FileAttributes GetFileAttributes(string path)
         {