Hi John and Sp0iLeDBrAt, thank you both for your responses. Unfortunately, I tried your suggestions but still had no luck. I finally installed a full XP and got the CHM IFilter running. However, this filter did not work very good, especially in handling large .chm files. The best way to index .chm files is, still, to convert them into .pdf format. This is the lesson I learned, and hopefully, it may help someone make a more informed decision in the future. Thank you all, and cheers!