Install and register 64 bit dll from 32 bit MSI

[Menegoni]

I have a need to install and register both 32 bit and 64 bit versions of a dll when on a 64 bit system from a single MSI used forinstalls on 32 and 64 bit systems.

Can this be done via InstallShield ?
If yes what version?
How?

lee

[DebbieL]

It's not possible because of a limitation with Windows Installer. See the following post in Heath Stewart's blog for details:
Different Packages are Required for Different Processor Architectures

Debbie Landers
Acresso Software

[Menegoni]

What I did was to install the 64 bit Dll to the appropriate directory and invoke the 64 bit regsvr32 in a custom action.