To strictly require and verify administrator privileges in an x64 environment, you must check if the EUID is 0 .
To ensure your getuidx64 implementation or any application is robust, professional, and secure, adhere to these best practices: getuidx64 require administrator privileges better
: Registering new background tasks or services that require higher security clearance. How to Grant Administrator Privileges To strictly require and verify administrator privileges in
If getuidx64 attempts to resolve the current process UID but does so by iterating through system process lists or accessing \Device\PhysicalMemory (a common mistake in poorly ported Unix tools), Windows’ security model will block it. Unique identifiers are often stored in secure areas
Unique identifiers are often stored in secure areas of the Windows Registry. Standard users have read-only access to most registry hives. Writing or reading machine-specific keys requires elevated permissions. Preventing Malware Exploitation