Cannot find Amnesia Program File

[DatJenkins]

Hello community,
I have been trying to install a Custom Story onto Amnesia, however I cannot find the Program File with the "Custom_Stories" folder.
I have checked my Program Files, and Amnesia is not there.
The only Amnesia file I can find contains a folder named "Main" and that seems to contain my save data, and a couple of notepad files. That is the only relevant folder I can find if I type "Amnesia" into the Start Search Bar.
I would really appreciate your help, because I completed the game and really want to play the Custom Stories.
Thanks in advance.

[Traggey]

Where did you get the game from?

The steam verision installs to programfiles/steam/steamapps/common/Amnesiathedarkdescent