having the same issue - there must be an answer somewhere!
You do realize the post you replied to was made in 2006, right?
At any rate, you are saying you are linking to a PDF and it is failing? Perhaps the link below will help?
Helpful and Handy Links
Hi Rick - yup, I realize it was a vintage post. Yes, a PDF placed in a topic for download gives me the mk:@MSITStore + URL of my chm, in the browser. (IE8). I am on an XP system - others in my office on WIndows 7 see the help just fine, as I just discovered. Will check your link, but I bet I already did it. Have reregistered DLLs, have tried placing the files on our webserver, no joy. For me. I suppose it could be worse, with noone able to access.
Thanks for helping me kick the dead and rotting horse!