eWriter Help is available with viewers for both Windows and MacOS. The standalone Windows eViewer is also available in a Windows Store version, that the user is prompted to install when they open a file with the .ewriter extension. In addition to this there are download installers for the various viewer versions for end users, and versions of the viewers for developers to install with their software for application help.
See eWriter Help in the Publishing chapter for full details.
The options in the HTML Export Options section for WebHelp are also used for eBooks (ePUB, Kindle/Mobi) and eWriter Help. These settings are accessible in the WebHelp section of your project configuration. Settings that are not relevant for individual formats are ignored in those formats.