The error message is a common issue for users running legacy operating systems. This fatal error prevents applications from launching entirely.
Understanding the GetSystemTimePreciseAsFileTime Windows 7 Error
The back-ported version relies on the same KeQueryPerformanceCounter internal mechanism but wrapped in FILETIME format. In practice, you can expect on most modern hardware running the update.
if (osvi.dwMajorVersion >= 6 && osvi.dwMinorVersion >= 2) // Supports GetSystemTimePreciseAsFileTime (Windows 8+) else // Windows 7 or older - use fallback
void GetPreciseOrFallbackFileTime(FILETIME* ft) HMODULE hKernel = GetModuleHandleA("kernel32.dll"); if (hKernel) GetSystemTimePreciseAsFileTime_t pGetPrecise = (GetSystemTimePreciseAsFileTime_t)GetProcAddress(hKernel, "GetSystemTimePreciseAsFileTime"); if (pGetPrecise) pGetPrecise(ft); return; getsystemtimepreciseasfiletime windows 7 upd
According to Microsoft documentation , GetSystemTimePreciseAsFileTime is a function introduced in Windows 8 and Windows Server 2012. It retrieves the current system date and time with the highest possible level of precision (less than 1 microsecond). It is often used in: High-frequency trading applications. Multimedia processing. Performance profiling tools.
For users willing to venture outside official support, community-driven projects offer a lifeline.
Example snippet (conceptual):
If you are developing software that needs to run on both Windows 7 and newer versions, use GetProcAddress to check for the function at runtime. If it's missing, fall back to GetSystemTimeAsFileTime , which is supported on Windows 7. The error message is a common issue for
Before deploying software to Windows 7 systems, verify compatibility:
🛠️ Why the "GetSystemTimePreciseAsFileTime" Error Occurs
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
[DllImport("kernel32.dll", SetLastError = true)] static extern void GetSystemTimePreciseAsFileTime(out long lpSystemTimeAsFileTime); In practice, you can expect on most modern
But this only improves to ~1 ms, not microseconds.
, which is much faster but has a resolution limited by the system timer tick (usually 1ms to 15.6ms). For applications requiring sub-millisecond accuracy—like high-frequency trading or scientific logging—the "Precise" version became the gold standard. The Windows 7 Dilemma: Is there an Update? The short answer is
: Install VxKex, right-click the application's executable, and enable "VxKex" in the compatibility settings. 2. Downgrade the Application 14.6 doesn't support Win 7? - FreeFileSync Forum