static BasicMimeTypesX()
        {
            MTIDict_ByEnums      = AllTypes.ToDictionary(v => v.MimeType, v => v);
            MTIDict_ByMimeNames  = AllTypes.ToDictionary(v => v.MimeTypeString, v => v);
            MTIDict_ByExtensions = AllTypes.Where(v => v.Extension.NotNulle()).ToDictionary(v => v.Extension, v => v);

            for (int i = 0; i < AllTypes.Length; i++)
            {
                MTI mti = AllTypes[i];

                if (mti.ExtraMimeStrings.NotNulle())
                {
                    foreach (string extMimeStr in mti.ExtraMimeStrings)
                    {
                        if (!MTIDict_ByMimeNames.ContainsKey(extMimeStr))
                        {
                            MTIDict_ByMimeNames.Add(extMimeStr, mti);
                        }
                    }
                }

                if (mti.ExtraExtensions.NotNulle())
                {
                    foreach (string ext in mti.ExtraExtensions)
                    {
                        if (!MTIDict_ByExtensions.ContainsKey(ext))
                        {
                            MTIDict_ByExtensions.Add(ext, mti);
                        }
                    }
                }
            }
        }