VB6 forms have a little picture in the upper-left that controls the menu for Close, Move, Restore, and so forth (what is the name of that menu, by-the-by?), and in my current application a previous owner has replaced that icon with a corporate logo.

Sadly it is now the wrong corporate logo and it now needs replacing. Has anyone any idea how to do this? I can’t see anything in the properties page that looks like it does that job.
Check on the Project-Properties, Make tab. The Icon dropdown should have one of your forms selected. You can then change the Icon property on that form to be a different icon.
Edit: I initially read this as just about the main application icon, which is what the above steps will be setting. Each individual non-child form can have it’s own icon, set by the Icon property for that form.