Wikipedia
AmigaGuide is a hypertext document file format designed for the Amiga, files are stored in ASCII so it is possible to read and edit a file without the need for special software.
Since Workbench 2.1 an Amiga Guide system for O.S. inline help files and reading manuals with hypertext formatting elements was launched in AmigaOS and based on a viewer called simply "AmigaGuide" and it has been included as standard feature on the Amiga system. Users with earlier versions of Workbench could view the files by downloading the program and library AmigaGuide 34 distributed with public domain collections of floppy disks (for example on Fred Fish collection) or it could be downloaded directly from Aminet software repository. Starting from AmigaOS 3.0 the AmigaGuide tool was replaced with more the complete and flexible MultiView.