zelda spirit tracks with a .sfv file??

i obtained a file with spirit tracks and a sfv file with the same name. what is an sfv file and do i put it on the card with the game? but most of all what does the file do? let me know if this is good and if you want this ill give ya the site i got it off of.
thanks
marcus/EE

http://www.techsono.com/faq/sfv.htmlnot sure if this is the same thing

yes that is correct. It is not needed.