Windowsupdate_12yo_ci.7z

: These files are typically intended to be temporary. If you find them in folders like C:\Windows\Temp or \AppData\Local , they are usually safe to delete once an update has successfully finished. Important Security Note: CVE-2018-10115 & CVE-2022-29072

: 7z (High-compression format using the LZMA/LZMA2 algorithms). WindowsUpdate_12YO_CI.7z

If you are managing this file with an older version of the 7-Zip software (prior to version 18.05 or 21.07), be aware of several critical vulnerabilities: What is the "package.7z" File? - Bitwarden Community Forums : These files are typically intended to be temporary

is an archive file associated with Windows Certificate Transparency (CT) logging and potential diagnostic or security monitoring activities within the Windows operating system . Technical Breakdown If you are managing this file with an

: You will most often find such files in temporary update directories or diagnostic logs generated when Windows is performing a large-scale certificate sweep or updating its internal revocation lists. Why Is It on Your System?

: This specific file naming convention ( _CI.7z ) typically suggests it contains Code Integrity (CI) logs or telemetry data used by Windows Update to verify the authenticity and transparency of system certificates.

: It is often a byproduct of the Windows Update service or a system-run diagnostic tool like SFC (System File Checker) or DISM (Deployment Image Servicing and Management).