| 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 designed for similar purposes, several differences might make one more suitable than the other for a given task or environment:
The distinction between autoruns64 and autoruns64a is not about features or performance, but about historical architecture. The former is a relic for a dead platform (Itanium), while the latter is the workhorse for the x64 world we live in today. This seemingly redundant pair serves as a quiet reminder of the turbulent transition to 64-bit computing. For the system administrator or power user, the lesson is simple: ignore the "64" and look for the "a" —it is the tool that will keep your modern Windows system secure and booting cleanly.
The core difference between Autoruns64.exe and Autoruns64a.exe is the processor architecture they are designed for. Use Autoruns64.exe for standard 64-bit Intel or AMD processors (x64), and use Autoruns64a.exe for 64-bit ARM processors. Architectural Compatibility
When you download the Microsoft Sysinternals Autoruns package, you are presented with multiple executables to ensure the tool can run natively across all modern Windows environments:
Autoruns.exe: The 32-bit version for older x86 systems. It often acts as a "launcher" that can automatically detect a 64-bit system and pivot to the appropriate version.
Autoruns64.exe: The native 64-bit version for the x64 architecture used by nearly all modern Windows laptops and desktops powered by Intel or AMD.
Autoruns64a.exe: The native 64-bit version specifically for ARM64 architecture, which powers devices like the Surface Pro X or newer Windows-on-ARM machines. Functional Parity
Functionally, both files are identical. They both serve as powerful diagnostic tools that display the most comprehensive list of auto-starting locations on a Windows system—from standard startup folders and registry keys to complex entry points like browser helper objects (BHOs), scheduled tasks, and AppInit DLLs. Security and Maintenance autoruns 64 vs autoruns 64a
Because these tools run with high privileges to modify system startup behavior, it is critical to use the version that matches your hardware to avoid emulation overhead or potential errors in driver reporting.
Malware Impersonation: Be aware that because Autoruns64.exe is a legitimate tool, some malware may attempt to disguise itself by using the same filename if it is found in non-standard directories like C:\Windows\System32.
Command Line Equivalents: If you prefer scripting or automation, the suite also includes autorunsc64.exe (for x64) and autorunsc64a.exe (for ARM), which provide the same data in CSV or XML format.
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
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.
Scenario: You have a new Snapdragon X Elite laptop. Malware hides a persistence entry via a custom ARM64 shell extension.
Recommendation: Use autoruns64a exclusively on ARM64 hosts. | Feature | Autoruns 64 (x64) | Autoruns
Summary
Feature comparison (major areas)
Reliability & safety
Performance
Extensibility & integrations
Security considerations
Practical workflow recommendations
Pros & Cons (concise)
When to pick which
Appendix — Key action checklist before using either tool
If you want, I can:
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Report: Autoruns 64 vs Autoruns 64a
Introduction
Autoruns is a popular utility developed by Sysinternals, a renowned company in the field of Windows system utilities. It is used to monitor and manage the auto-start locations in Windows, allowing users to control what programs and services start automatically when the system boots up. The utility comes in various versions, including 32-bit and 64-bit editions, to support different Windows architectures. This report focuses on comparing two specific versions: Autoruns 64 and Autoruns 64a.
Background
Comparison
Autoruns is the ultimate startup and persistence viewer, far surpassing MSConfig or Task Manager. With the rise of ARM64 Windows laptops (e.g., Snapdragon X Elite), Microsoft now provides two native 64‑bit builds. At a glance they look identical, but under the hood, architecture matters.