The File Checksum Integrity Verifier (FCIV.EXE) is a free command-line utility provided by Microsoft. Its purpose is to compute and verify cryptographic hash values (also known as checksums) for files.
This utility generates MD5 or SHA-1 hash values as checksums for files. It can save the hash values and filenames to an XML file, and compare against a previous XML file to see if any files have been modified.
The FCIV utility is available here. The Microsoft KB article is available here.
Remember, FCIV helps ensure data integrity by allowing you to verify files against their original hash values. It’s a handy tool for anyone concerned about file authenticity and security