The .hlp files are updated pages for the Help Files for the Xbasic PDE. You can update your own help files using the PDE in text mode, or any text editor. They may be overwritten the with the next release of Xbasic or if you recompile the source code See https://groups.io/g/MaxReasonsxBasic for any questions or suggestions.
The Quick Reference Guide PDF file is formated for legal size paper. Check out some of the links for getting started with Xbasic.