initial win64 changes

Closed Bitbucket Importer requested to merge bitbucket/declined-pr-546 into branch/default

Created originally on Bitbucket by sthalik (Stanisław Halik)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

That's not much but a start, I guess.

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