Hello BasimAlvi
If you can't find the DLL under the program files, then it is in the GAC. This means you have to develop on a project server, preferably in a test environment.
You will have to develop solution with a project server 2007 environment. I would suggest creating a VM and installing the simple standalone version when you run the wizard.
Cheers!
Michael
PS. This is the best place for posting question. I noticed that you had it listed twice.
Michael Wharton, MBA, PMP, MCT, MCSD, MCSE+I, MCDBA
www.WhartonComputer.com