PSI - the only thing you need to move is the nw.exe file; everything else you can leave alone (at least that's what I've been doing without any problems). Most of the files are just duplicates of each other, while c2 adds dxwebsetup.exe and d3dcompiler_46.dll for compatibility reasons. From Ashley's tutorial here
"When publishing Windows apps, NW.js only supports the faster and more powerful WebGL rendering mode if the latest DirectX runtime components are installed. The exported dxwebsetup.exe file installs these if they are not already present on a user's system. You should ensure this is installed on user's systems before running your project, for example by creating an installer for your game that runs the file as one of the installation steps. " I think that dxwebsetup requires the d3dcompiler dll.