The legacy 32-bit instruction set used by traditional Intel and AMD processors. When we talk about "32-bit apps" in the context of Windows on ARM, we are almost always talking about x86 apps (like old versions of Chrome, Photoshop, or countless legacy business tools). The operating system runs these apps via an emulation layer.
Open Task Manager → Details tab. Look at the “Platform” column: windows 10 arm 32 bits
Here is the bottom line: