Before extraction, use a tool like 7-Zip or WinRAR to check for archive errors. Ideally, verify the file's MD5 or SHA-256 checksum against the source provider's documentation to ensure the file hasn't been tampered with.
Indicates this is the first official release of the fix. Subsequent updates would typically follow as REV-B, REV-C, etc. sc14988-REV-AFix.rar
For system-level fixes, it is standard practice to deploy the contents of the archive in a staging environment first to monitor for unintended side effects. Before extraction, use a tool like 7-Zip or