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#41
It does get puzzling if you start looking at that sort of thing. The first 5 are certainly applications- not part of the OS as delivered by MS. As such, they have most likely been placed there when the particular application was installed. As such, you'd need to contact the author in each case.
Others may well be able to add more.
You could of course try deleting some of the duplicates just to see what happens... but I couldn't possibly recommend that