How to open an .sfv file:
There are a few nice software applications available that can open an SFV file and run a check on the downloaded archive. However, the one that I typically use is called QuickSFV and is entirely free to use.
1. Download QuickSFV (from this link :http://www.quicksfv.org/download.html) to your computer, then launch the executable and proceed to install QuickSFV
2. Once your reach the File Associations section, make sure to check the SFV box as pictured below:
http://www.lancelhoff.com/wp-content/uploads/2008/10/sfv-association.png
3.If all goes well, you should now be able to open any SFV files that may have come bundled with your downloaded archives and check the archive for corruption. Simply browse to and double click the .sfv file to open it with QuickSFV.