Out of interest, how do you make use of an Add-In created in Visual Basic 6 which contains forms.

I've got an .xla that I use for something but I fancy trying to recreate it in VB6. It has two forms. The minute I chose the Add-in option for a new project I was given a form that I couldn't preview and any tutorials I've looked for online have all been for a .dll file which just adds extra functions to Excel.