https://bugs.winehq.org/show_bug.cgi?id=50759
--- Comment #6 from Robert Walker bob.mt.wya@gmail.com --- (In reply to Jacek Caban from comment #5)
Using MSI files is sub-optimal, but fine. Wine will locate it and quietly install when you will attempt to use it. To verify that, you may just run wine iexplore. If it works, it means that Gecko works fine. After the first run, Gecko will be installed in the prefix.
I see that running:
wine iexplore
does automatically install wine-gecko ...
Thanks for clarifying this functionality! I think you can close this bug report as INVALID.