The Slenderman Files website is no longer functional, however it is saved on the Wayback Machine. I'm not sure how much of the website was saved.
Old link: http://www.slendermanfiles.org
Link to Archive: https://web.archive.org/web/20221130094404/http://www.slendermanfiles.org/
Old link: http://www.slendermanfiles.org
Link to Archive: https://web.archive.org/web/20221130094404/http://www.slendermanfiles.org/