hello the sfv file is used to check whether the rar files that it came with or ok get it here http://www.softpedia.com/get/Others/Miscellaneous/SFVlite.shtml install it,and use it to open the sfv file it will run a check on the bunch of rar's that it came with its useful when you download something that has a corrupt archive,enabling you to pinpoint the damaged file,and then you can either try and re-download just that rar,or give the uploader some grief cheers!!!