Changes in Windows between 16-bit, 32-bit, 64-bit
First 64-bit version was Windows NT/2000 64-bit AXP for the Digital AXP processor.
32-bit added to 16-bit included first Freecell game.
SysWOW64 is where the 32-bit code is stored (or registry keys) on a 64-bit Win 10-11 and the 64-bit code is in System32
Program Files Program Files (x86)
Windows\System Windows\System32 Windows\SysWOW64