AttachmentStorage | Deprecated. The ExtendedStorage object of this attachment. Applies only to file attachments. | 
  AutoPost | If true, the database is updated immediately when the field value changes. | 
  Data | If the attachment is a file, an array of bytes. If a reference to file, the path or URL. | 
  Description | The attachment description. | 
  DirectLink | The link or the attachment file name on the server machine. | 
  Field | The value of the specified field. | 
  FileName | If a file, the file location. If a virtual file, the location for the attachment before it is uploaded to the server. If a URL, the link address. | 
  FileSize | Obsolete.Use IAttachment3 FileSizeEx instead. The attachment file size in bytes. | 
  FileSizeEx | The attachment file size in bytes. | 
  ID | The item ID. | 
  IsLocked | Checks if object is locked for editing. | 
  LastModified | The last modified time. | 
  Modified | Checks if the item has been modified since last refresh or post operation. If true, the field properties on the server side are not up to date. | 
  Name | The attachment name. | 
  ServerFileName | The path to the attachment on the server machine. | 
  Type | The attachment type. Either File or URL. | 
  Virtual | Checks if this is a virtual item, that is, an item that does not have a corresponding database record. |