Remove DLL from system32 folder when uninstalling a setup from InstallScript project for 64-bit

Question

I have InstallShield 2011 and I am creating a setup for 64-bit in an InstallScript project.

When I install a setup, the DLL does go into system32 folder on a 64-bit system. But the problem is that when I unintall the setup, the DLL in system32 is not deleted.

If I copy the DLL in SYSWOW64 folder and uninstall the setup, the DLL is removed from the SYSWOW64 folder but not from systen32.