The patched version adds ~40 ns overhead compared to native due to the extra calculations and frequency query caching. However, for almost all real-world applications, this is negligible.
Because the function is missing from the Windows 7 native KERNEL32.dll , the OS loader immediately aborts execution at startup. This triggers the "Entry Point Not Found" crash before the application window can even render. Methods to "Patch" and Fix the Error
While a native Microsoft update (such as a KB article) will not add this specific function to the core OS, several highly effective technical workarounds can patch the software behavior. 1. Implement Extended Kernels (The OS Patch) getsystemtimepreciseasfiletime windows 7 patched
You do not need to explicitly call this function in code to trigger the error. Modern application environments have updated their background runtimes to force high-precision timekeeping:
The absence of GetSystemTimePreciseAsFileTime on Windows 7 is an unavoidable reality rooted in Microsoft's API evolution. For users of legacy applications, the solution often involves finding a "patched" version of the software that has been compiled with an older toolchain, such as iperf 3.14 or 3.16. For developers, the best practice is to implement a runtime fallback, using GetSystemTimePreciseAsFileTime when available and gracefully degrading to GetSystemTimeAsFileTime for older systems. The long-term trend is clear: toolchains and libraries are moving forward, and ensuring broad compatibility requires deliberate and careful coding practices. While the term "patched" typically refers to user-implemented workarounds rather than an official Microsoft solution, the need for such patches underscores the ongoing demand for software that respects the longevity and stability of the Windows 7 platform. The patched version adds ~40 ns overhead compared
The GetSystemTimePreciseAsFileTime patch for Windows 7 is a clever piece of systems engineering—a testament to the community’s ability to fill gaps left by vendor decisions. It works, often remarkably well, and has powered countless legacy applications for years.
Download the latest release of from its official GitHub repository. This triggers the "Entry Point Not Found" crash
For , the solution involves API patching. This technique intercepts the call to GetSystemTimePreciseAsFileTime and redirects it to a different, compatible function. The most straightforward substitution is to replace it with GetSystemTimeAsFileTime because both functions have identical function signatures, requiring no other code changes. When this is done, the application can run on Windows 7, albeit with reduced timing precision.
: Beginning with Rust 1.78, the Rust standard library raised its minimum requirements to Windows 10, causing std::time to drop the legacy fallback entirely.