Determined developers and reverse engineers – notably contributors to projects like ReactOS, Wine, and various open-source performance libraries – set out to patch this gap. The result is a set of unofficial patches and code wrappers that emulate GetSystemTimePreciseAsFileTime on Windows 7.
Some system-level patches (often for specific applications like game servers or databases) install a kernel shim. This requires loading a signed (or test-signed) driver that modifies the System Service Dispatch Table (SSDT) to redirect the system call originating from GetSystemTimePreciseAsFileTime. This is risky, triggers PatchGuard (Kernel Patch Protection) on 64-bit Windows 7, and is generally not recommended for production systems. getsystemtimepreciseasfiletime windows 7 patched
Windows 7’s kernel (NT 6.1) simply does not export this function from kernel32.dll. Microsoft added it as part of a broader time management overhaul in Windows 8, including improvements to the KeQueryInterruptTimePrecise kernel API. Microsoft made a deliberate decision not to back-port it, likely to encourage migration to modern OS versions. This requires loading a signed (or test-signed) driver