This feature attempts to load the Windows 8+ API dynamically. If it fails (indicating Windows 7), it calculates the time by combining the steady performance counter with the system wall clock.
Availability and compatibility
This article explores why this error occurs, why a simple cannot fix it natively, and the step-by-step workarounds available to restore your favorite software on Windows 7. What is GetSystemTimePreciseAsFileTime ?
Windows 7 does not include this function in its native KERNEL32.dll . Therefore, when an application calls this function, the operating system cannot locate it, leading to a DLL load-time failure. getsystemtimepreciseasfiletime windows 7 upd
HMODULE hKernel32 = GetModuleHandleA("kernel32.dll"); FARPROC pFunc = GetProcAddress(hKernel32, "GetSystemTimePreciseAsFileTime");
// Read initial time base at app startup LARGE_INTEGER freq, qpcStart; FILETIME ftStart; QueryPerformanceFrequency(&freq); QueryPerformanceCounter(&qpcStart); GetSystemTimeAsFileTime(&ftStart); // Later: compute elapsed QPC, convert to FILETIME offset
Older legacy software uses the standard GetSystemTimeAsFileTime API, which works natively on Windows 7 but offers lower clock resolution. When an application compiled with newer developer tools attempts to load on Windows 7, KERNEL32.dll fails to find the precise timestamp entry point, causing an immediate crash at startup. How to Fix the Error on Windows 7 1. Implement an API Wrapper via VxKex This feature attempts to load the Windows 8+ API dynamically
Since there is no official Microsoft update (KB) that adds this function to the Windows 7 kernel, users and developers must use one of these alternative approaches: Windows 7 support - General Usage - Julia Discourse
Load the function at runtime with GetProcAddress . Fall back to GetSystemTimeAsFileTime + QueryPerformanceCounter hybrid if not available. This ensures compatibility across all Windows 7 SP1 systems (patched or not).
If you are a developer, this is the most robust approach. Modern, well-written software doesn't just assume an API exists; it checks for it at runtime. What is GetSystemTimePreciseAsFileTime
This situation changed with the release of a specific .
: Cygwin 3.5.0 and above no longer support Windows 7, leading to binaries compiled with these toolchains failing on older systems.
