That is a bit confusing, but System32 and SysWOW64 both are the links to same folder containing 32-bit DLLs. Windows x64 has a real directory System32 that contains 64-bit DLLs. Thus native processes with a bitness of 64 find “their” DLLs where they expect them: in the System32 folder. A second directory, SysWOW64, contains the 32-bit DLLs. The file system redirector does the magic of hiding the real System32 directory for 32-bit processes and showing SysWOW64 under the name of System32.