Why is it that:
- a 32-bit OS, when installed on a 64-bit CPU, can run old 16-bit applications,
- but if you install a 64-bit OS it can't run those applications directly and need some sort of emulation (that doesn't always work perfectly)?
To be more specific, I have an 64-bit processor (Intel Core 2 Duo). When I had Windows XP and Windows 7 (both 32-bit) installed, they could run old DOS and 616-bit Windows applications.
Now I have installed the 64-bit edition of Windows 7. Why can't it run those same applications anymore?