How to circonvent this weird comportment. Perhaps, it is not possible to open a pdf file from mathematica. But this is not the full problem.
1 Answer
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Hyperlink["description",
"http://coco-m.web.lynchburg.edu/multiplicative calculus.pdf"]
Evaluate the link, then click on description.
http://
. Then -1 for posting a picture rather than code text. I'll retract the downvote after you post the code. $\endgroup$