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Retrieve system installation date from system.ini (PowerShell)

(Get-Item "C:\Windows\system.ini").CreationTime

Fetches the creation date of the C:\Windows\system.ini file, which can be used as an indicator of the system installation date. Alternatively, you can use C:\Windows\inf\setupapi.dev.log or C:\Program Files\WindowsApps\ instead of C:\Windows\system.ini.

system information [kb:256]