If memory serves me the 2.5.2extreme.mfs file is actually an iso image. You'll need to rename the file with a *.iso extension and burn it to a CD as an iso image. The CD should be bootable. Follow the installation instructions for 2.5Xtreme and you'll be fine. Make sure you indicate that you have a larger hard drive during the installation so your swap file is set up correctly and also so the image will expand to the full size of your drive.
Please don't PM me or any other members looking for personal assistance. You'll do better by posting (after you've exhausted the search feature, of course) and taking advantage of the collective expertise of the membership instead of a single individual that may or may not be able to help you. Thank you and enjoy your stay at DDB!