How to control over Internet Explorer upload and download events?

[C# Programming]

Hi All,

I want to control over Internet Explorer's upload and download events. Upload and download should happen only for allowed file types. And the file type need to be identified based on the file MIME type. Policy is set for each user. Based on the policy upload and download should happen. Can anybody help me?

Sample Policy:

Allowed URL: www.gmail.com
UPload: jpg,gif,zip,doc
Download : rar,xls,doc

Allowed URL : www.yahoo.com
Upload : .txt
Download : .xls

Solution can be either in VC++ or C#. Thanks in Advance......