64-bit Windows: have the installer use the correct default installation directory (closes #484).
64-bit Windows: have the installer use the correct default installation directory (closes #484).

mirams/opencor,Fairly/opencor,Fairly/opencor,mirams/opencor,mirams/opencor,mirams/opencor,mirams/opencor,Fairly/opencor,Fairly/opencor,Fairly/opencor