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Thanks, all.
I found and killed the circled items with Shmnview just because I wanted to see the difference with Shexview. It seems that both work. Some programs do have options to display in context and some don't. Some, like Avast, sprinkle the menu with several entries. I'm still stumped on "Open in PDF-XChange editor."
Sorry for the late reply - the "Open in PDF-XChange editor" item can be disabled in ShellMenuView by looking for the extension .xcvault or file type XCVault.
I apologize if the topic is old, yesterday I had the same problem and in the google search I got this discussion.
I had the problem with PDF-XChange Editor. Solve the problem through CCleaner, disabling it in the contextual menu.
Regards.