Pasquale on the BibleWorks forum has created a module that lets you browse the maps here directly from BibleWorks (though it helps if you have Google Earth installed). Download the file (35 MB .zip). The forum post has more instructions.
BibleWorks accepts regular HTML Help (.chm) files with some supporting metadata, so it looks like Pasquale created a local version of parts of this website. Nifty! You don’t even need BibleWorks to browse the file itself; any recent Windows computer should work fine. The only disadvantage to a local file, of course, is that it can’t include any new corrections that I make on the site.
I’m linking to a file hosted here here because the file linked on the forum is split into five pieces, which you have to download separately and reassemble. The above link is a simple .zip file.