You can access the 32- and 64-bit registry views from the 32- and 64-bit editions of Visual Build. By default, the 32-bit edition accesses the 32-bit registry view, but can access the 64-bit view on 64-bit Windows by checking the
Access 64-bit registry view option. And the 64-bit edition accesses the 64-bit view by default, but it can access the 32-bit view by checking the
Access 32-bit registry view option.
http://www.kinook.com/VisBuildPro/Ma...adregistry.htm
By "a way on the "Step Starting Event" to set some macro's to determine what hive it access," if you mean that you want to dynamically check the 32-/64-bit options based on a macro, you can use a field override to do that.
http://www.kinook.com/VisBuildPro/Ma...htsub=override