Open a file in C# 2.0

Hi,
    I am using a windows application to read the inbox and display mails and their attachments.
Now when user clicks on the attachment I have to display the actual file (it may be .txt or .xls).
I am having the attachment file path. How to fetch the file from the path and display it to the user.
Note: As we do in the normal outlook mails.


Vinoth