https://bugs.winehq.org/show_bug.cgi?id=39699
--- Comment #7 from Bernhard Übelacker bernhardu@mailbox.org --- Patch got committed: https://source.winehq.org/git/wine.git/commit/e3b28631485a010219928a888fcc54...
Small remark: This edtw.chm help file seems to be faulty because native has also troubles showing index entries between W and Z.
But the crash is mitigated, so I guess this bug can be closed?