Wow64 — Microsoft

: While 32-bit apps are still limited to their own memory space (typically 2GB or 4GB), moving to a 64-bit system increases the overall virtual memory available to the entire OS.

Understanding WoW64 in Microsoft Windows (Windows 32-bit on Windows 64-bit) is a compatibility layer provided by Microsoft that allows 32-bit (x86) applications to run on 64-bit versions of Windows without modification. It is essentially a bridge that translates 32-bit system calls into 64-bit calls that the Windows kernel can understand. How WoW64 Works Wow64 Microsoft

: Windows uses redirection to keep 32-bit and 64-bit software data separate: : While 32-bit apps are still limited to