I was sure 64bit DLL cannot link to 32bit DLL.
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Wow64 has a file redirector. It has the same named dlls but are stored in the appropriate location. The concept is explained at http://msdn.microsoft.com/en-us/library/aa384187(v=vs.85).aspx
The %windir%\System32 directory is reserved for 64-bit applications. Most DLL file names were not changed when 64-bit versions of the DLLs were created, so 32-bit versions of the DLLs are stored in a different directory. WOW64 hides this difference using a file system redirector.
In most cases, whenever a 32-bit application attempts to access %windir%\System32, the access is redirected to %windir%\SysWOW64. Access to %windir%\lastgood\system32 is redirected to %windir%\lastgood\SysWOW64. Access to %windir%\regedit.exe is redirected to %windir%\SysWOW64\regedit.exe.