[64-bit] How do I detect whether 32-bit Java is installed on x64 Windows, only looking at the filesystem and registry?

If it is not Oracle's Java, you may not be able to tell. When I install Oracle Java 64-bit, the files go into C:\Program Files\Java, but when I install a 32-bit version, they default to C:\Program Files (x86)\Java instead. Of course, the person who installed Java could have overridden those defaults.

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