Windows ARM laptops won't support 64-bit apps
Microsoft is gearing up to launch ARM laptops with Windows which will run existing non-ARM apps using Windows on Windows on ARM. This will support 32-bit x86 apps only. x64 apps will not be supported. Microsoft has said that they will likely support 64-bit standard apps at some point in the future but, according to all the reporting so far, this will be a very big engineering effort to get done since Windows on Windows has always been 32-bit-only and even if it is updated to support 64-bit, it will encounter a performance hit that 32-bit apps won't.
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