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Apple has decreed death to 32-bit apps on Macs, but DVD Player is now the only remaining 32-bit application included within macOS High Sierra’s already 64-bit default software stack.
What is Apple planning?
You can check which of your apps run in 32-bit in About This Mac>System Report>Applications where you’ll find a column called 64-bit. Click this, and you’ll see which apps don’t yet run that way.