Rebel.Cms.Web.FileExtensions.GetMimeType C# (CSharp) Method

        public static string GetMimeType(this File file)
        {
            if (file != null)
            {
                var extension = Path.GetExtension(file.Name);
                var fileExtension = extension.IsNullOrWhiteSpace() ? file.Name : extension.ToLower();
                var rk = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(fileExtension);
                if (rk != null && rk.GetValue("Content Type") != null) return rk.GetValue("Content Type").ToString();
            }
            return "application/octet-stream";
        }