Inviting users from your contact list

Is the API not supported in Windows? I have all of my contacts in the People app. It would be very convenient if Discourse could access contacts from that app for invitation purposes. Could I possibly use Google Contacts as a workaround?

Also, is the API included in all Chromium browsers? I’m wondering if it would work in Microsoft Edge, Opera, etc. On top of that, is the API included in Firefox and Safari?