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________________________________________You don't even need to launch the game to view the Encyclopedia, you can simply use a web browser.
Just create a shortcut that points to ...
C:\Program Files\Steam\steamapps\common\total war shogun 2\data\encyclopedia\how_to_play.html
C:\Program Files (x86)\Steam\steamapps\common\total war shogun 2\data\encyclopedia\how_to_play.html
Note: You will need to adjust that link depending on where you have installed the Steam client.