| 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) |
For 99.9% of users today, Autoruns64a is the only relevant version. Running the plain autoruns64.exe on a standard PC will result in an immediate "This app can't run on your PC" error, because the instruction sets for Itanium and x64 are binary incompatible.
Conversely, running autoruns64a on an Itanium server would fail. However, given that Microsoft dropped support for Itanium over a decade ago, encountering such a server in the wild is extraordinarily rare.
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.
Before dissecting their differences, it is essential to understand their common purpose. Both autoruns64 and autoruns64a scan over 100 startup locations, including the Run registry keys, scheduled tasks, services, browser extensions, and boot execute images. They present this data in a digestible table, allowing administrators to disable, delete, or save entries. Both require administrative privileges to function correctly, and both are capable of digitally verifying signatures to distinguish legitimate Microsoft processes from potential malware.
Autoruns 64 is the 64-bit version of the Autoruns utility. Designed for use on 64-bit Windows operating systems, it provides a comprehensive view of all programs and services set to launch at system startup or user login. This tool is invaluable for system administrators and power users looking to troubleshoot issues related to startup performance, malware infections, or simply to declutter their system's startup process.
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 autoruns 64 vs autoruns 64a
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.
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
The primary difference between autoruns64.exe autoruns64a.exe processor architecture they are built for. While both are part of the Microsoft Sysinternals Autoruns suite, they target different hardware. Microsoft Learn Comparison at a Glance autoruns64.exe autoruns64a.exe Architecture x64 (64-bit Intel/AMD) Common Devices Most modern laptops and desktops. Surface Pro 9 (5G), ARM-based laptops. Standard 64-bit Windows systems. Devices with ARM processors. Result of Wrong Choice Won't run on ARM devices. Errors like "not a valid Win32 application" on Intel/AMD. Key Breakdown Target Audience: autoruns64.exe
is the standard version for nearly all modern PCs using Intel Core or AMD Ryzen processors. autoruns64a.exe is a specialized build for the | Your system | Recommended build | Why
architecture, commonly found in ultra-portable tablets or newer Windows on ARM laptops. Functionality:
Both versions provide the exact same "comprehensive knowledge" of auto-starting locations, including registry keys, services, and shell extensions. They allow you to identify and disable unnecessary startup programs or potential malware. Other Variants in the Folder: autoruns.exe
: The 32-bit (x86) version, which usually auto-launches the 64-bit version on compatible systems. autorunsc.exe autorunsc64.exe : Command-line versions used for scripting and automation. Microsoft Learn Which one should you use? For almost all standard users, autoruns64.exe
is the correct choice. If you aren't sure, running the generic autoruns.exe
will typically detect your system type and launch the correct 64-bit version for you automatically. Microsoft Learn Are you troubleshooting a specific startup error or looking to your boot time? Which autoruns executable to use? - Microsoft Q&A
The primary difference between autoruns64.exe autoruns64a.exe processor architecture
they are designed to run on. Both are 64-bit versions of the Sysinternals Autoruns utility, but they target different hardware platforms. Microsoft Learn Core Technical Differences autoruns64.exe (x64) : This version is built for x86-64 (AMD64/Intel 64)
processors. It is the standard executable for the vast majority of modern 64-bit Windows laptops and desktops using Intel Core or AMD Ryzen chips. autoruns64a.exe (ARM64) : The "a" suffix stands for . This version is compiled specifically for | Feature | Autoruns 64 (x64) | Autoruns
processors, such as the Qualcomm Snapdragon chips found in "Always Connected" PCs (e.g., Surface Pro 9 with 5G or Samsung Galaxy Book). Microsoft Learn Functionality Comparison
Aside from their underlying architecture, the two files offer identical features for managing startup locations: autoruns64.exe autoruns64a.exe Full Graphical User Interface (GUI) Full Graphical User Interface (GUI) 64-bit Windows (x64) 64-bit Windows (ARM64) Scans registry, services, and tasks Scans registry, services, and tasks Supports VirusTotal hash checks Supports VirusTotal hash checks Which One Should You Use?
For a standard Windows installation on an Intel or AMD processor, you should use autoruns64.exe
. If you try to run the wrong version, Windows will typically display an error stating that the file is "not a valid Win32 application". Microsoft Learn
If you prefer using the command line instead of the visual interface, look for the counterparts autorunsc64.exe autorunsc64a.exe (ARM64), where the "c" indicates the command-line version. Microsoft Learn suspicious startup items? 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 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 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 Sysinternals Utilities - Microsoft Learn
| Feature | Autoruns 64 (x64) | Autoruns 64a (ARM64) | |---------|------------------|----------------------| | Target architecture | AMD64 / Intel 64 | ARM64 (e.g., Snapdragon) | | Runs on x64 Windows | ✅ Native, best performance | ❌ Won’t start (invalid image) | | Runs on ARM64 Windows | ✅ Via emulation (Prism) | ✅ Native, no emulation | | Registry/WOW64 access | Full native x64 registry view | Full native ARM64 registry view | | Driver scanning | Sees x64 kernel drivers | Sees ARM64 kernel drivers | | Memory footprint | ~3–4 MB | ~2.5–3 MB | | Startup speed (ARM64 host) | ~1.2 seconds (emulated) | ~0.6 seconds (native) |
While both Autoruns 64 and Autoruns 64a are powerful tools for managing startup applications on 64-bit Windows systems, they cater to slightly different needs. The choice between the two versions should be based on the specific requirements of the task at hand. For general use, Autoruns 64 is a robust option. For more detailed analysis, particularly with regards to executable path handling, Autoruns 64a provides an alternate and sometimes preferable approach.