As far as I'm aware, 32-bit programs still work well on 64bit incarnations of Windows, so you could try moving everything down to 32-bit Perl. I haven't looked into it, so I'm unaware of any immediate problem of Win32::API on 64-bit Windows. But I know it uses some assembly language to achieve the call between Perl / C and the operating system, so that part might get tripped up by the registers changing size.

In reply to Re^4: Cross-Compile Perl Modules for Win x64 by Corion
in thread Cross-Compile Perl Modules for Win x64 by fatmcgav

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