For people that have ran into this problem, you need two files, this is incredibly easy to do, I am mostly posting it here for my own reference since I never see to be able to find this information when I need it lol. Here it is!
.inf files can only run an .exe, so you have to make a executable file that opens the .pdf which in turn the .inf can autorun.Open Notepad and type:
[autorun]
shellexecute = “start.bat”
icon = autorun.ico
——————————
Then open Notepad again and type:
start=<filename>.pdf
then save it as start.bat
(without the brackets)
(If your filename has spaces in it, replace the spaces with an under_score)