Release 220 (64-bit), with the latest nw.js v 0.13
EDIT: No, I was wrong. v0.13 produces .exe that don't work (neither in preview or export), so I'm using v0.12 (Chromium 41)
As stated in the release notes for 220:
[quote:3qdwofvg]NW.js 0.12 and older don't work with Construct 2 r217+ - you must use NW.js 0.13 or newer instead.