When in 10.2 and I attempt to open an application that is not
supported, Classic commences to load.

The horizontal barbers pole in the Classic window keep twirling for
minutes - last effort 7 minutes. When I clicked outside the Classic
window it disappeared and I was able to use the application.

Does the twirling barber's pole ever stop?

What's the 'Classic' window displaying? Happy Mac? Icons? A dialog? You'll need to have the triangle in the classic startup window 'twiddled' to show what Classic's doing as it boots.

Thanks,
Shay