Setting ACLs from non-domain computer

I am using System.Security.AccessControl to set ACLs.

I am also using LogonUser() to gain access to a share from a computer that
is not on the domain (using LOGON32_LOGON_NEW_CREDENTIALS).

What I can't figure out is if there is anyway to set ACLs on
directories/files for groups from a non-domain computer.  If I try and
simply pass in "domainname\groupname" to FileSystemAccessRule() I get an
exception when I go to modify the access rule (this works fine from a
computer on the domain).

It seems it might work if I could get a WindowsIdentity for the group, but I
don't know how to do this or even if it can be done (is there such a thing
as a WindowsIdentity for a group?).

Any help or pointers is appreciated.

Thanks,
-Mont

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