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.
Reliability & safety
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 application, meaning it runs directly on the hardware for maximum speed and accuracy when scanning system files. Autoruns - Sysinternals - Microsoft Learn autoruns 64 vs autoruns 64a
| Build | x64 PCs | ARM64 PCs | Forensic value | Speed | |-------|---------|-----------|----------------|-------| | autoruns64 | ★★★★★ | ★★★☆☆ (emulated) | ★★★★★ | ★★★★★ (x64) / ★★★☆☆ (ARM64) | | autoruns64a | ❌ Doesn’t run | ★★★★★ | ★★★★★ | ★★★★★ (native ARM64) | This binary is compiled for Intel Itanium processors
For a standard Windows installation on an Intel or AMD processor, you should use autoruns64.exe Today, Itanium is effectively obsolete