https://github.com/denolfe/AutoHotkey/blob/d7fa8b42c477c186a323f8d3d98276239bff0295/lib/Explorer.ahk#L60C26-L60C39
if (class ~= "(Cabinet|Explore)WClass")
It's missing the "r" in ExplorerWClass - easy to miss with how the pattern is broken up, and with "explore" being a word.
I doubt this is important since it'll apparently only apply if explorer is launched with the /e flag (source) but I noticed it so I thought I'd give a note anyway.