[Windows]-can I compile a 64 bit application in 32 bit?ppu?

[RPoseika]

I thought I could.
*I created my first application and compiled it and ran
under XP. SUCCESS
*I then went under Compiler Options and change the target CPU
to X86_64 and the Target OS to Win64.
I get compile errors in regards to missing ppu files.
(I was not expecting it to run - but compile-maybe).
What files / packages am I missing or what config
did i not do?

Thanks in advance

Lazarus newbie

[Leledumbo]

You need to have all used units compiled for x86_64-win64, and of course ppccrossx64 (CMIIW).