C# - How do I get the “Everybody” user? [duplicate]

Answer 1

The name that the English version of Windows uses is "Everyone".

You can get the user regardless of language by using the WellKnownSidType.WorldSid value:

var sid = new SecurityIdentifier(WellKnownSidType.WorldSid, null);
var account = (NTAccount) sid.Translate(typeof(NTAccount)); 

Answer 2

I believe the way to do it has been answered here: How can I get the local group name for guests/administrators ?

This "everyone" SID is a well known SID "S-1-1-0" (the list is availalble here: Well-known security identifiers in Windows operating systems).