When I tried googling this situation I found lots of varied suggestions, none of which seemed to apply. What seems to have worked, fortunately, was the following procedure which I believe triggered an update/refresh of the cached icon-image for Acrobat.
PROCEDURE
- located original 'acrobat.exe' in C:\Program Files\Adobe\Acrobat 9.0\Acrobat
(I noted that it had the correct icon but it was missing from Task Bar once opened) - created a shortcut to the .EXE
(the shortcut also had the correct icon) - opening the shortcut showed the correct icon!
- At this point I temporarily pinned the app to the Task Bar.
- I tried opening some PDFs and found that they opened in the pinned app and with the correct icon
- I unpinned the app from the Task Bar
- I opened some PDFs again and now the icon is correct
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UPDATE: And just like that it's gone... I thought I had fixed it this morning but now it's broken again.
UPDATE: And just like that it's gone... I thought I had fixed it this morning but now it's broken again.