The navigate and open functions on router in the Custom UI bridge do not treat mailto: links correctly. Rather than opening a mail app, the bridge tries to navigate to the links in the browser.

Steps to replicate:

1. Create a Custom UI Forge App
2. Importe Router to the project;
3. Attempt to use router.navigate or router.open passing a mailto: URL;

Expected results:
Mail app opens with the target address being the one passed as parameter.

Actual results:
A browser window opens attempting to access the email address as URL (appending https:// to it).