SFV stands for Simple File Verification. Files containing the .sfv extension are used for storing the checksum data of files, folders, or disks that are on the user's computer. The SFV files look for files that do not "add up" to the checksum data in the SFV file, such as files that are missing or corrupt.
File verification is commonly used when copying disks or downloading files from the Internet. The .sfv files can look to see if a file has been modified or if something is wrong with it, but it can not verify the authenticity of the file.
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If you have additional information about the SFV file format or software that uses files with the SFV suffix, please do get in touch - we would love hearing from you.