I believe LaunchServices is keeping track. So there will be some clues either in sudo /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister -dump output and/or entries in ~/Library/Preferences/com.apple.LaunchServices/com.apple.LaunchServices.plist.
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Okay, see the "Architectures for arm64" dict inside the plist file I mentioned.
Is something going on with arm64e in Asia? It seems like that ABI is being used unless a whole lot of individuals are disabling SIP and using the boot arg?