All image files (jpg, bik, gif) go in the 
"C:users/yourname/my documents/trackmania/mediatracker/images" folder.

All sound files (ogg, wav, mpg) go in the 
"C:users/yourname/my documents/trackmania/mediatracker/sounds" folder.

Download the mod from http://dl.dropboxusercontent.com/s/pv3b9ht5vrsb7pe/HauntedMansion.zip

Place zip file (dont unzip) in "C:users/yourname/my documents/trackmania/skins/stadium/mod" folder.