Outlook cannot open a .csv attachment

Hi,
There is a problem with my Microsoft Outlook 2007. It cannot open a .csv attachment.
This is the first time I have ever received such file,and my boss requires me to view it. There is no change done in my Outlook 2007, and I have tried to open other attachments such as the word document, pictures, or even PDF, but it worked fine.
It is just that this .CSV attachment cannot be opened. What should I need to do for it to work?
Or is there a configuration I need to setup in order to view this?
If it may help, the file is 2434KB.
Please assist.
