http://bugs.winehq.org/show_bug.cgi?id=5061
--- Comment #10 from Vincent Povirk madewokherd@gmail.com 2009-11-22 11:25:39 --- We map the windows "HTML Format" clipboard format to the native "text/html" even though they're different formats. See http://msdn.microsoft.com/en-us/library/ms649015%28VS.85%29.aspx
The "HTML Format" has metadata and context, while "text/html" is only a fragment.
Even if we extracted only the fragment from "HTML Format", we couldn't make a generally correct conversion because the HTML may contain Windows paths.