change an older app from 32 bits to 64 bits architecture

I just tried to change an older app from 32 bits to 64 bits architecture.
Unfortunately all open and close commands concerning files don’t work proper anymore. Couls perhaps someone explain the reason to me and how to solve this issue?

Xojo 2018 Release 4.
Mac Mini (2018) OS Mojave

Thanks a lot!

These: http://documentation.xojo.com/Dialog ?

Thanks for the reply. Unfortunately this was not the question. The question was why I’m getting errors when changing the architecture from MAC OS 32 Bits to 64 Bits. I could’nt find any restictions in the documentation.

Your question is way to generic. How do you open and close your files? What do you mean with “don’t work proper”? You need to isolate your code and make an example of what doesn’t work.

What was the error that you have been getting ?

There should not be any restriction and for the most parts if you do use Declares, it’s probably an easy switch over.

Which version of Xojo was the 32 Bit version compiled in ?