Opening Docs when in the game

[neonlicht]

AFAIK, all JTS games allow the player to open various documents, when in the game, via the Help Menu (e.g. "Getting Started" and "User Help" etc.).

My question is this:

Is it possible to add documents (as text files or PDFs) that can be opened via the Help Menu? In other words, is there any way to open player-made custom docs (e.g. a Hotkeys list, or an Order of Battle, or a list of Commanders) while in-game, via the Help Menu? If so, how to do it?

I realise, of course, that you can just run the game and open a doc in Windows, but I was curious to know if custom docs could be opened via the Help Menu in-game.

Many thanks in advance for replies! :-)