You did not ask about steam specifically, I’ll Google that for you as well.
Why is Steam moving to full 64-bit and dropping 32-bit OS support?
Future versions of Steam will only support 64-bit OS’ moving forward. Why? The simple answer is that planned platform upgrades and core features of Steam rely on drivers and other libraries that only support 64-bit OS’. Future versions of Steam will only support 64-bit OS’. That means that users of 32-bit OS’ should upgrade their systems. Valve recommends that users do this “sooner rather than later”.
You did not ask about steam specifically, I’ll Google that for you as well. Why is Steam moving to full 64-bit and dropping 32-bit OS support?
Future versions of Steam will only support 64-bit OS’ moving forward. Why? The simple answer is that planned platform upgrades and core features of Steam rely on drivers and other libraries that only support 64-bit OS’. Future versions of Steam will only support 64-bit OS’. That means that users of 32-bit OS’ should upgrade their systems. Valve recommends that users do this “sooner rather than later”.
You can join the discussion on Steam’s 64-bit upgrade on the OC3D Forums. https://overclock3d.net/news/software/steam-has-finally-upgraded-to-64-bit/