RE: XML under ActiveState Perl for 64-bit Windows

On Wed, 06 May 2009, Randy Kobes wrote:
> Something I've been asked about, and was wondering myself, since I
> don't have a 64 bit machine to play with - would a ppm package:
> http://cpan.uwinnipeg.ca/dist/XML-LibXML built on a 32 bit machine
> work on a 64 bit machine (in principle)? For
> XML::LibXML, this would mean the external libxml2 library, as well as
> the perl glue, that goes into making the ppm package would have to
> be compatible.

You can run all 32-bit Windows software on 64-bit Windows automatically
(using the WOW64 subsystem: "Windows on Windows 64").  So you can install
32-bit Perl and use all the 32-bit modules you want.

However, you cannot load 32-bit libraries into a 64-bit process, so if
you are using a 64-bit Perl, then all extensions must be compiled in
64-bit mode as well.

WOW64 does some wild things for compatibilities sake, so there are some
reasons why you may want to run a 64-bit application on 64-bit Windows.
For example parts of the registry and file system are remapped to different
hives and trees under WOW64, so some 64-bit areas will be inaccessible
to 32-bit applications.

Cheers,
-Jan

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