Register protocol handlers

Set this policy (recommended only) to register a list of protocol handlers. This list is merged with ones registered by the user and both are available to use.

To register a protocol handler:

- Set the protocol property to the scheme (for example, "mailto")
- Set the URL property to the URL property of the application that handlers the scheme specified in the "protocol" field. The pattern can include a "%s" placeholder, which the handled URL replaces.

Users can't remove a protocol handler registered by this policy. However, they can install a new default protocol handler to override the existing protocol handlers.

Example value:

[
{
"url": "https://mail.contoso.com/mail/?extsrc=mailto&url=%s",
"default": true,
"protocol": "mailto"
}
]

Register protocol handlers

Registry Hive	HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry Path	Software\Policies\Microsoft\Edge\Recommended
Value Name	RegisteredProtocolHandlers
Value Type	REG_SZ
Default Value