[Bug 41985] CHM viewer does not use default window

https://bugs.winehq.org/show_bug.cgi?id=41985

--- Comment #1 from Johannes  ---
Clarification: OpenMPT explicitely tells the HtmlHelp API to use the "OpenMPT"
window configuration through HtmlHelp(m_hWnd, "OpenMPT Manual.chm>OpenMPT",
...), so Wine should already be able to handle the window information, but
probably does not honor the "Default Window" setting.
Since the help viewer does not show any menus or toolbars to toggle any of the
display features such as the TOC, this effectively renders the CHM file
unusable when opening it directly: Only the start page of the help file is
viewable.