How to find xls.spudsoft extension file in BIRT 4.3.1 while exporting the report and naming the tabs

Persa

<div>Hi ,</div><div> </div><div>I am using BIRT 4.3.1. I need to create multi tabbed output in excel. I developed a sample report using BIRT emitter and I get multi tabbed output but I cannot open the file in xls_spudsoft format since the extension file is not available.How can I find out xls_spudsoft extension file for multi tabbed output and also how to assign names for every sheet in the excel dynamically? </div><div> </div><div>Thanks In Advance.</div><div> </div><div>For more reference I have attached a sample design file</div>