I downloaded what was supposed to de a video file, but when I got it, it was a .sfv file, and it won't play on any program I've tried. I've never even heard of this file type before, is it even a video file? How do I open it?
Well I have found that many people do not even use SFV files, let alone know what they are for. Their purpose is to verify the integrity of all the files using a CRC check. Since split RAR files cannot be modified once created (without corrupting them) this is very usefull on this type of file. Any modification in size or structure to the file, usually when your modem messes the data up, will cause the CRC check to fail.
You can easily verify your downloaded files using a special program and the SFV file. The best one I have found is QuickSFV, so download that and install it. Let it associate with at least SFV and whatever else you want. Now all you need to do is double click the SFV and it starts checking the files, simple as that.
I figured out the problem, the rar I downloaded was split into 8 pieces, but it only asked for parts 1,3,5,7 and 8, I tried unraring all parts and it came up as an sfv file. I re-unrar'ed it and it works fine now, thanks for trying to help though