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Hi, you may find the following of interest, if not of immediate help, but it may suggest something..
As it turns out, the data for the Jump List items isn’t in the registry at all, but in the user’s AppData. Specifically, in a collection of files in %AppData%\Microsoft\Windows\Recent\AutomaticDestinations. There’s one file per application; I had a somewhat magical 42 files in mine. I noted that there is also a similar folder called %AppData%\Microsoft\Windows\Recent\CustomDestinations, with fewer files in it, and which I suspect contains a cache of Jump List items that have been added programmatically by each application (such as the ‘Play All Music’ command on Media Player’s Jump List.
The files in these folders don’t have particularly useful names, but if you open them in Notepad the contents will give you a clue as to what program each one belongs to (note: don’t edit the files directly). When I compared the folder on different machines it was clear the names are the same for each application.
The file for Explorer.exe was actually the first in the list for me, and is called 1b4dd67f29cb1962.automaticDestinations-ms. The solution was simple; delete the file. As soon as I had removed it, I was able to re-pin folders, the removed file was recreated, and my life was once again sane.