CHM file not displaying at runtime

I have a weird bug. When I am debugging a C# Winform application and I select the help button from the menu, I can see the help file (chm file) fine. It displays in its own popup window. But when I install the application and then hit the same button, the help file does not show up at all.

What could be causing this?

Edit: I have also tried changing the "Build Action" on the .chm file to "Content" and then to "Embedded Resource", but those di开发者_如何学God not make a difference.