C:\program files(x86)\
Only exists on x64 versions of Windows, hence an x64 CPU is always present [or emulated]. Unlike Linux, for example, Windows x64 can execute programs compiled for x86. To do so, Windows x64 uses something called WoW or "Windows on Windows". The exception was Windows XP x64 [not to be confused with Windows XP Professional x64 Edition] which only ran on Intel Itanium processors and therefore lacked x86 mode. It was rather short lived.