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Edit: Mystery Solved.
Post edited March 03, 2016 by Darvond
Toby changed the engine from Game Maker 8 to Game Maker Studio during production and Game Maker Studio cannot deal with external files the same way Game Maker 8 does, which is why the manual feature from the demo version had to be dropped from the final game.
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blueskirt42: Toby changed the engine from Game Maker 8 to Game Maker Studio during production and Game Maker Studio cannot deal with external files the same way Game Maker 8 does, which is why the manual feature from the demo version had to be dropped from the final game.
Oh. So that was a demo feature. :V
I'm intregued, what was this lost feture like?
As you performed specific actions in the demo, like sparing or killing certain or all monsters, the demo would edit the manual to reflect your actions. Some of those changes are listed on the Undertale Demo page of the Undertale Wikia.