app/assets/images/favicon/browserconfig.xml.erb
<?xml version="1.0" encoding="utf-8"?>
<browserconfig>
<msapplication>
<tile>
<square70x70logo src="<%= asset_path 'favicon/mstile-70x70.png' %>"/>
<square150x150logo src="<%= asset_path 'favicon/mstile-150x150.png' %>"/>
<square310x310logo src="<%= asset_path 'favicon/mstile-310x310.png' %>"/>
<wide310x150logo src="<%= asset_path 'favicon/mstile-310x150.png' %>"/>
<TileColor>#b91d47</TileColor>
</tile>
</msapplication>
</browserconfig>