Sorry for the confusion, since your project type is installscript you wont find this option template summary, and installscript project is by default a 32 bit exe, that is the reason it add registry to 32 bit location, however you can create your registry and add files to 64 bit location, Please refer below help on how to access 64-bit folders from script calls, see Enable/Disable WOW64FSREDIRECTION.
https://docs.revenera.com/installshield19helplib/Subsystems/installshield19langref/helplibrary/LangrefWINSYSDIR64.htm
Targeting 64 bit machine
https://docs.revenera.com/installshield19helplib/helplibrary/Targeting64Bit-IS.htm
Create a 64 bit registry:
https://community.flexera.com/t5/InstallShield-Knowledge-Base/Create-a-64-bit-Windows-Registry-Entry-via-an-InstallScript/ta-p/193440/jump-to/first-unread-message
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