Thanks for the tip @Walter Schulz! (Is it there an html version of the guide available?)
-Unfortunately I do not read german

Furthermore I've found this
The helpfiles from old version. Unrar and just copy to SD card.
I have copied the files from Doc folder of an old ML2.3 to the Doc folder of my NB.
They are not seen by ML.
I've tried to open the files from the "File manager" but it doesn't work.
File extension is .bmh.. I don't know to what Sf it is associated with.
Any thougth?