Although source code for Vcl.OleAuto is still provided, the 64-bit lib directory does not include Vcl.OleAuto.dcu . Instead, you should use System.Win.ComObj and / or System.Win.ComServ . Note that the source for Vcl.OleAuto indicates that this item is deprecated and tells you what to use instead.
If we look at the source for Vcl.OleAuto , we can find the 32-bit asm code that has not been ported. Presumably, Embarcadero decided not to transfer this to 64 bits, because the device is outdated.
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