I have MMP 2.01 and in this version the Guide is a .chm file, which is a Windows help file format. I believe that a .hh file is a "help map" file that goes with the older .hlp Windows help format files (though .hh is also a C++ header file format, but that doesn't make any sense as something to distribute with a program). Windows help files can be viewed by double clicking them since the support is built into Windows. But they can't be edited without having special authoring programs.