An .SFV file
is a file generated by a program such as WinSFV or QuickSFV. It is used to check a group of downloaded files for error
s using a checksum
. Whoever posted the files that you downloaded would normally generate the .SFV file and post it. After you downloaded these files, you would run a check to make sure there were no errors when you received them.
To use .SFV files, you need find a copy of WinSFV or QuickSFV. After installing the program, it associates the .SFV extension with QuickSFV or WinSFV.
After you download a large set of files, such as an episode of Doctor Who called The Power of Kroll, you can check the files to verify that there were no errors when you downloaded the files.
An example of what is in an .SFV file:
; Generated by WIN-SFV32 v1.01a on 2000-10-09 at 02:03.28
; 10000000 01:46.24 2000-10-09 Kroll_DiVX_1of4.r00
; 10000000 01:46.26 2000-10-09 Kroll_DiVX_1of4.r01
; 10000000 01:46.28 2000-10-09 Kroll_DiVX_1of4.r02
; 10000000 01:46.30 2000-10-09 Kroll_DiVX_1of4.r03
; 10000000 01:46.32 2000-10-09 Kroll_DiVX_1of4.r04
; 10000000 01:46.34 2000-10-09 Kroll_DiVX_1of4.r05
; 10000000 01:46.36 2000-10-09 Kroll_DiVX_1of4.r06
; 10000000 01:46.40 2000-10-09 Kroll_DiVX_1of4.r07
; 10000000 01:46.42 2000-10-09 Kroll_DiVX_1of4.r08
; 8917545 01:46.44 2000-10-09 Kroll_DiVX_1of4.r09
; 10000000 01:46.22 2000-10-09 Kroll_DiVX_1of4.rar
The first part of the program lists the files to be checked, and their file sizes. Note that each part is about 10 megs in size. The second part of the .SFV file has the names of each file and the CRC checksum for each part. When you run the .SFV program, it generates a CRC checksum and compares it to the checksum in the file. If they don't match, the program will tell you. You may need to re-download the bad part to get a complete episode of Doctor Who.
If you are unfamiliar with the extension .RAR and .R00, .R01 etc., it is a file archiver program similar to WinZip. It uses the RAR compression technique, and if preferred on Usenet because you can set individual part sizes. If I unarchived the file Kroll_DiVX_1of4.rar, it would be a file that was about 108 megs in size.