Did you try to find the CLSID, like discussed in that thread? That would perhaps be the best starting point.
"A better way to block a shell extension by CLSID is to add it to Opus's blacklist: Go to Preferences - Miscellaneous - Advanced and double-click the ignore_context_menus setting. A small window will appear into which you should paste the CLSID values, including curly braces, of the extension(s) you want to exclude, one CLSID per line."