HelpStudio and Document! X require a Help compiler In order to compile HTML Help or Help 2.0 Help files.
Links to download the latest version of the HTML Help 1.x and Help 2.x compiler can be found in the Help Compilers Knowledge Base Article
Innovasys is a market leading provider of documentation and help authoring tools. Formed in 1997, Innovasys is focused on producing tools that enable developers and technical writers worldwide to produce professional quality documentation, help systems and procedures with minimum friction. Document! X and HelpStudio are used worldwide by leading corporations and software vendors including Infragistics, Telerik, Dundas, Xceed, GrapeCity and Microsoft.
HelpStudio is the fastest, easiest way to create and publish help systems, knowledge bases or procedures and integrate them with your desktop, web or mobile applications or components. Generate help output in cross-platform Browser Help, HTML Help (CHM), Help 2.0, Microsoft Help Viewer or printable PDF.