To Generate a .csi file Follow the following step.
1) Visit this website www.tin-nsdl.com or Click Here.
2) Click on Choice "Tan Based View"
3) Enter Your Tan Number
7) Select Challan Tender Date/Date of Deposit (Period) for which .csi file is required.
8) Now .csi file can be downloaded at any where on your desktop or any other place.