FWIW, during Elevate 2023 I have a session on migrating to PowerBuilder 2022 R2.  One of the things I cover is migration to 64 bit.

https://www.appeon.com/conference/elevate-2023/agenda.html

Hi, Subrat -

If your legacy app uses external function declarations to interface with Windows API functions and/or locally-developed or third-party DLL's, you should be aware that there are several possible issues that can arise when migrating from 32-bit to 64-bit. Of course, these DLL's all need to be 64-bit. There can be issues related to the size of Windows "handles", how structure members are laid out in memory and the effect this can have on structure size. In addition to the excellent migration guide publication that Chris has referenced, you may wish to look in the PB Tech Articles section of the Community web site. Here is a link to one article in particular you may find helpful that is primarily concerned with 32-bit/64-bit differences:

    https://community.appeon.com/index.php/articles-blogs/tutorials-articles/2-powerbuilder/303-interfacing-pb-applications-with-the-windows-api-part-2

I don't know if you have recently upgraded your PFC libraries, but the early versions of the PFC contain objects and methods that have been removed or refactored, and new objects have been added as PB has evolved since the PFC debuted in PB 5, so you may wish to consider upgrading to the newest version of the PFC.

   https://github.com/OpenSourcePFCLibraries

Good luck with your migration project!

Hi Subrat;

  FYI: https://docs.appeon.com/pb2022/migrating_32bit_applications_to_64bit/index.html

HTH

Regards ... Chris