Paul Jackson 26. Feb 12, 2021, 3:23 AM. Hello, The Sysinternals Autoruns utility includes multiple executable files: autoruns.exe, Microsoft Learn

Command-line automation and scripting on standard 64-bit PCs. ARM64 (Command-line) Command-line automation on ARM-based devices. Why Multiple Versions Exist

(Invoking related search suggestions now.)

The letter in autoruns64a.exe is the key. It stands for ARM64 .

The "a" in autoruns64a stands for (or more broadly, x64 architecture). The version without the "a" is compiled for the Itanium (IA-64) 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)

In summary, if you're working with 32-bit applications on a 64-bit system and need to understand or troubleshoot their registry interactions, autoruns64a provides a more accurate view of their registry activity. For general use or when working primarily with 64-bit applications, autoruns64 is sufficient.

: Use this for standard 64-bit PCs running Intel or AMD processors (x64).