MachineGuid lives at HKLM\SOFTWARE\Microsoft\Cryptography. It's set during Windows install and survives every update. Microsoft uses it for Windows Update, telemetry, and licensing checks.
It's also used by every Microsoft Store app, Office 365, OneDrive, and many third-party tools (Adobe Creative Cloud, Steam). For an anti-cheat it's an obvious fingerprint anchor.
Changing MachineGuid through Regedit is dangerous: Office, OneDrive, Adobe will demand reactivation. The right approach is a coordinated rewrite together with the rest of the HWID profile.
Our changer handles MachineGuid as part of the standard profile. After applying, all related Microsoft services automatically reactivate within 1–2 days through your existing accounts.
Important: if you didn't link a Microsoft account to your install, do that BEFORE the HWID change. Otherwise Office and OneDrive will demand the original product key, which you may have lost.