Holds type of the attachment.

A String value.  

object.Type

The Type Property syntax has these parts:

By looking at this property, you can examine attachment mime type and decide what you should do with it. For example, you might find 'text/plain' inside, which means you can use Notepad to properly open this file. If it's 'text/html', you should open it with your browser. For ZIP files, it will be 'application/x-zip-compressed'. For general binary files, 'application/octet-stream' type will be used. In such cases, you should store file to disk.

Of course, there are many mime-types. Above mentioned are ones mostly used.