IE Plugin for Live.com to modify HTTP Webrequest and Webresponse 2

IE Plugin for [login to view URL] to modify HTTP Webrequest and Webresponse We have to make a plugin for IE that will execute on [login to view URL] website. The plugin should encrypt data in a file attached on [login to view URL]'s email. The plugin also have to modify the name of the file by adding ".enc" at the end of the file. When an encrypted file attached in an email is downloaded, the content of the file should be decrypted, and the ".enc" should be removed from the name of the file. This project is for a trusted client. No payments or milestones will be created until the project is completed, and tested by the client, and until the client is satisfied. Whoever bids $150 or less be hired immediately.