If you attempt to execute the ARM64 application on a standard x64 Intel or AMD processor, Windows cannot interpret the instruction set. The operating system will instantly block execution and throw an explicit error message stating that the file or is incompatible with your version of Windows. Under the Hood: Why Matching Architecture Matters
What prompted you to download Autoruns? Which Windows operating system version are you running?
Running the 64-bit version ( autoruns64 ) on an ARM device might work through emulation, but autoruns64a will run natively, offering better performance and accuracy. Quick Comparison: Autoruns64 vs Autoruns64a Autoruns64.exe Autoruns64a.exe Architecture x64 (AMD64/Intel64) Processor Type Standard Intel/AMD ARM/Qualcomm Snapdragon Target System Typical PC/Laptop Surface Pro X, ARM Laptops Performance Native on x64 Native on ARM64 How to Choose the Right One? autoruns 64 vs autoruns 64a
When in doubt, you can simply run autoruns.exe (the 32-bit version). It is compatible with all versions of Windows and will still give you a highly functional view of your system's startup entries. However, for power users and security analysts, using the native version for your architecture is the best practice.
In the intricate ecosystem of Windows system administration, few tools are as revered as Autoruns. Developed by Microsoft Sysinternals, this utility provides an unparalleled view into every process, driver, and registry key configured to launch during system startup. However, a peculiar nuance often confuses new users: the presence of two 64-bit executables— autoruns64.exe and autoruns64a.exe . While they share the same icon and core functionality, a deeper examination reveals a critical distinction rooted in Windows architecture and the evolution of system security. If you attempt to execute the ARM64 application
: This is for standard 64-bit Intel or AMD processors (x64). If you are on a typical modern laptop or desktop, this is the one you want.
Microsoft has aggressively pushed Windows on ARM. Devices like the Surface Pro X, Lenovo ThinkPad X13s, and the new Surface Laptop Studio 2 (ARM variant) run Windows 11 ARM64. These devices can run x86 and x64 applications through emulation (Prism), but native ARM64 applications run faster, use less battery, and have full access to the underlying hardware without emulation overhead. Which Windows operating system version are you running
available for the "a" version to automate your system checks?
Autoruns 64 vs Autoruns 64a: Which Sysinternals Tool Should You Use?
: The legacy 32-bit (x86) executable built for standard Intel/AMD systems.