Error: “Unable To Locate MFC71U.DLL”

[XnTriq]

Whenever I right-click on a thumbnail with the Ctrl key pressed to get to the system's context menu, I get this error message:

xnview.exe - Unable To Locate DLL: The dynamic link library MFC71U.DLL could not be found in the specified path...

XnView v1.95.4 + XnView Shell Extension v2.3
(I can't upgrade to SE v2.5, because my file manager is not compatible with newer versions.)

[xnview]

And in windows explorer, no problem??

[XnTriq]

AptEdit's shell extension turned out to be the culprit. I had deactivated the extension, but there were some entries left in the registry. Weeding out those manually solved the problem.