: 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. WindowsUpdate_12YO_CI.7z
: 7z (High-compression format using the LZMA/LZMA2 algorithms). : You will most often find such files
: 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 WindowsUpdate_12YO_CI.7z
: 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).
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