Because it is written as a real document within the story, the contents of The Alan Wake Files are considered canon. It provides backstories, reports, and insights that are referenced directly in the Alan Wake and Control universes.
The GOG version of the game typically includes these extras as a separate download in your library under the "Extras" section. the alan wake files pdf link
The Alan Wake Files is a collection of documents, transcripts, and reports that provide insight into the events of the Alan Wake series. These files are presented in the form of a PDF, which can be accessed by fans interested in delving deeper into the game's lore. The documents include police reports, news articles, and even Alan's own notes, all of which help to flesh out the game's narrative and characters. Because it is written as a real document