No more pdf icon when insert pdf as object after reinstall

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Dear All

I had to reinstall adobe reader DC 2018. To do so adobe encourage you to use their cleaner tool, which I used.

I reinstalled adobe reader, which seems to be working fine.

I face a problem though.

When I want to insert an existing pdf file in a word document, I choose insert as object and check the box display as icon.

The problem is that there is no more pdf icon.See picture

I found that one way to temporarily solve it is to browse to the acrobat reader exe file. And indeed then I get the choice between two pdf icons.

The problem is; I have to navigate each time. How can I recreate this association / make sure that the pdf icons are proposed automatically in the above dialogue

Thanks