Subject to CPU frequency scaling drift on older hardware. Need to recalibrate periodically.

GetSystemTimePreciseAsFileTime is a Win32 API function defined in sysinfoapi.h . Its signature is:

The most frequent and frustrating issue developers encounter is the assumption that GetSystemTimePreciseAsFileTime is universally available across all modern Windows versions. This is not the case. The function has been available on Windows 7. According to the official Microsoft documentation and corroborated by countless developer reports, the function only exists on Windows 8 and newer client versions, and Windows Server 2012 and newer server versions.

The standard approach is:

This method prevents static linking issues and allows your application to work across multiple Windows versions.

The short answer is . There is no official Windows 7 update from Microsoft that adds GetSystemTimePreciseAsFileTime to the operating system. This is not a missing service pack or hotfix—it's a fundamental API that was never backported to Windows 7.

OSVERSIONINFOEX osvi = sizeof(osvi) ; GetVersionEx((OSVERSIONINFO*)&osvi);

Then use DLL redirection or import table patching to route calls through your compatibility layer.

if (pGetSystemTimePreciseAsFileTime) pGetSystemTimePreciseAsFileTime(ftOut); else GetSystemTimeAsFileTime(ftOut); // Optional: Improve resolution artificially with high-performance sleep // But that's a separate challenge

You can check if the update is installed via:

Several factors contribute to the increasing frequency of this error on Windows 7:

This situation changed with the release of a specific .

// win7_api_patch.dll void WINAPI GetSystemTimePreciseAsFileTime(LPFILETIME lpSystemTimeAsFileTime) GetSystemTimeAsFileTime(lpSystemTimeAsFileTime);