The easiest way is to go to ~/.local/share/applications/ and delete the wine-extension-htm.desktop file. It will remove the MIME association made by Wine (in this case Wine Internet Explorer for text/html files).
The easiest way is to go to ~/.local/share/applications/ and delete the wine-extension-htm.desktop file. It will remove the MIME association made by Wine (in this case Wine Internet Explorer for text/html files).