I tried adding an *.ico file for a custom icon in the Packager tab in Q 4.1.3 and get file type not supported.

What kind if Icons do I need to use?

Thanks,

They need to be standard Windows .ICO files, but I pre-XP format (as we're relying on VB6's icon support), so no bigger than 32x32 and not more than 24-bit colour depth.

You can try editing the file with Microangelo to create the correct icon type within the file, and remove any that Quest doesn't support.