For the record, I have NWN working on my Surface Pro 2. Installed it from GOG.com, where I re-bought it a while back as a back-up copy. Then replaced new cd keys with my old ones, as I heard the GOG keys can have issues, and ran the critical rebuild. It seems to work.
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Only problem I've found so far is that I can't directly run a module via F9 in the toolset, which is annoying. Anyone have a workaround for that in Windows 8?