How can I read email attachments in MIME format, in Gmail?

My friend keeps sending me attachments in MIME format, and I get the option to open as text, download, etc. No option seems to work. Help! Am willing to get a new program to open them, but which one?

How can I read email attachments in MIME format, in Gmail?
Download the evaluation version, it's free. http://www.winzip.com