Yes, I added "Embedded comment" with ctrl+D in browser mode to a JPEG.
"<Comment>" works when adding text to image (shift+T), showing information (I), batch rename ...
But works not when printing.
Here is one image with Embedded comment.
XnView 1.97.4 or 1.97.5, Windows Vista 64 Czech at home, XP 32 Czech at work,
problem with comment is overall.