Neat job. I know you've already worked it out, but here's an icon maker that does it all -- create, extract, convert, solid or transparent, etc. -- but it costs $30: Icon Maker
Google "icon maker freeware" and so much stuff pops up I didn't bother to check it all out.
Google "icon maker freeware" and so much stuff pops up I didn't bother to check it all out.