Possibly a 3rd-Party software Shell Extension. These are the items that
appear when you Right Click a file/folder, such as "Scan with AntiVirus".
There is a tool you can download/use to locate the software that hooks
into Explorer operations: http://www.nirsoft.net/utils/shexview.html
*Would rate it's complexity/use at around 6 out 10, to help you decide
whether to attempt to use it for your issue.
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