The primary difference between autoruns64.exe and autoruns64a.exe is the processor architecture they are built for. Choosing the correct one ensures the tool can correctly inspect system drivers and deep-level registry keys specific to your computer's hardware. Quick Selection Guide
Autoruns64.exe: Use this for standard 64-bit PCs running Intel or AMD processors (x64).
Autoruns64a.exe: Use this for 64-bit devices running ARM processors, such as the Microsoft Surface Pro (ARM version) or newer laptops with Snapdragon chips. Understanding the Executable Versions
When you download the Autoruns package from Microsoft Sysinternals, you will see several files. Each serves a specific environment: Architecture autoruns.exe 32-bit (x86) Legacy 32-bit Windows systems. autoruns64.exe 64-bit (x64) Most modern Windows 10/11 PCs (Intel/AMD). autoruns64a.exe 64-bit (ARM64) ARM-based laptops and tablets. autorunsc.exe Command Line Automation and scripting in 32-bit environments. autorunsc64.exe Command Line Automation and scripting for standard 64-bit PCs. 🚀 Why the "a" version exists
Modern laptops are increasingly using ARM processors (like those found in smartphones) for better battery life. Standard 64-bit apps (x64) sometimes run slowly through "emulation" on these chips. autoruns64a.exe is a native ARM64 application, meaning it runs directly on the hardware for maximum speed and accuracy when scanning system files. Autoruns - Sysinternals - Microsoft Learn
The primary difference between autoruns64 and autoruns64a is the processor architecture they are designed to run on:
autoruns64.exe: This is for standard 64-bit Intel or AMD (x64) processors.
autoruns64a.exe: This is specifically for 64-bit ARM processors. Key Feature: VirusTotal Integration
One of the most powerful features of both versions is the ability to check the reputation of your startup items directly through VirusTotal.
How it works: You can submit the hashes of autostart files to VirusTotal to see if they have been flagged as malicious by various antivirus engines.
Benefit: This helps you quickly distinguish between legitimate system processes and potential malware hiding in your boot sequence. autoruns 64 vs autoruns 64a
Are you currently troubleshooting a specific startup issue or just cleaning up your system? Which autoruns executable to use? - Microsoft Q&A
Paul Jackson 26. Feb 12, 2021, 3:23 AM. Hello, The Sysinternals Autoruns utility includes multiple executable files: autoruns.exe, Microsoft Learn
Which Autoruns executable for AMD Radeon 64-bit? - Microsoft Learn
When you download the Sysinternals Autoruns package, you’ll notice several different executable files. Choosing between Autoruns64.exe and Autoruns64a.exe depends entirely on your computer's processor architecture. Quick Comparison: Which One Should You Run? Executable Architecture Autoruns64.exe x64 (AMD64/Intel 64) Most modern desktop and laptop PCs. Autoruns64a.exe ARM64
Devices with ARM processors, like the Microsoft Surface Pro (ARM) or certain tablets. Understanding Autoruns64.exe
Autoruns64.exe is the standard version designed for the x64 architecture, which powers the vast majority of Windows computers using Intel or AMD processors.
Native Performance: Because it is compiled specifically for 64-bit Intel/AMD systems, it runs natively without needing any emulation.
Comprehensive Scanning: It has full access to the 64-bit areas of the Windows Registry and system files, which is critical for identifying malware that hides in 64-bit specific "Auto-start Extensibility Points" (ASEPs).
Usage Case: If you are on a standard 64-bit Windows PC, this is the version you should use. Understanding Autoruns64a.exe
The "a" in Autoruns64a.exe stands for ARM. This version is built specifically for devices running on ARM64 processors. The primary difference between autoruns64
ARM-Native: While ARM-based Windows devices can often emulate x86 or x64 software, running the native ARM version is more efficient and ensures the tool correctly reads architecture-specific startup locations.
Common Devices: You would use this on hardware like the Surface Pro 9 (5G), Lenovo ThinkPad X13s, or other laptops featuring Qualcomm Snapdragon processors.
Error Prevention: If you try to run the "a" version on a standard Intel or AMD machine, it will likely fail with a "Not a valid Win32 application" error. What About Autoruns.exe (The Standard Version)? The standard Autoruns.exe is the original 32-bit binary.
Self-Detection: Interestingly, if you run the 32-bit autoruns.exe on a 64-bit system, it is designed to detect your architecture and can automatically launch the 64-bit version for you.
Compatibility: It remains in the package primarily to support older 32-bit versions of Windows or minimal environments where 64-bit support is absent. Which autoruns executable to use? - Microsoft Q&A
When you download the Microsoft Sysinternals Autoruns suite, the ZIP file contains several different executables. If you're trying to figure out whether to click autoruns64.exe or autoruns64a.exe, The Quick Answer
Autoruns64.exe: This is the version for standard 64-bit Intel or AMD processors (x64). This is what most modern Windows PCs and laptops should use.
Autoruns64a.exe: The "a" stands for ARM. Use this version only if you have a device with an ARM-based processor, such as a Surface Pro X or a Mac running Windows via Parallels. Why are there so many versions?
Sysinternals provides different versions to ensure the tool runs natively on various system architectures for maximum performance and accuracy:
autoruns.exe: The standard 32-bit (x86) version. It will work on most systems but is optimized for older 32-bit Windows installs. Autoruns64 (without the "a"): This binary is compiled
autorunsc.exe: The command-line (CLI) version, useful for scripting or automated analysis. autorunsc64.exe: The 64-bit command-line version. autorunsc64a.exe: The ARM 64-bit command-line version. Pro Tip
If you aren't sure what processor you have, just try running autoruns64.exe first. If it isn't compatible, Windows will typically give you an error stating it is "not a valid Win32 application". You should also always Run as Administrator to ensure the tool can scan deep system registry keys and services that require high-level permissions.
If you'd like to know how to use Autoruns to safely speed up your PC or check for malware, just let me know!
Here’s a concise explanation of the difference between Autoruns 64 and Autoruns 64a from Microsoft Sysinternals.
The "a" in autoruns64a stands for "AMD64" (or more broadly, x64 architecture). The version without the "a" is compiled for the Itanium (IA-64) architecture.
Autoruns64 (without the "a"): This binary is compiled for Intel Itanium processors. In the early 2000s, Intel and HP developed the Itanium architecture (IA-64) as a high-performance 64-bit system for enterprise servers. However, Itanium failed in the consumer market. Today, Itanium is effectively obsolete. Unless you are maintaining a legacy Windows server from the mid-2000s (e.g., Windows Server 2008 for Itanium), this executable is useless.
Autoruns64a (with the "a"): This is the version for x64 processors—the AMD64 standard used by virtually every modern desktop, laptop, and server CPU from both AMD and Intel. When users download the Autoruns package on a typical Windows 10 or Windows 11 PC, autoruns64a.exe is the correct file to run.
False. That's what the Wow6432Node is for. Both 64-bit binaries (x64 and ARM64) see 32-bit startup entries via the Registry Redirector. You don't need a special build.
| Your system | Recommended build | Why |
|-------------|------------------|------|
| Intel/AMD (x64) | autoruns64.exe | Native, no emulation layer needed |
| ARM64 (Snapdragon, etc.) | autoruns64a.exe | Faster, lower RAM, avoids Prism translation |
| You share a USB toolkit | Both | Keep autoruns64.exe (works everywhere except pure ARM64 without emulation – rare) |