I´m trying to change a file´s access control at install time. More, specifically, through a Wix´s Custom Action, so I am sure that it is being executed with admin rights. 

Here´s the code:

```
   string pathVersioningDat = ConfigurationManager.GetPath("versioning.dat", true);
   FileSystemAccessRule rule = new FileSystemAccessRule("everyone", FileSystemRights.FullControl, AccessControlType.Allow);
   FileSecurity fSecurity = File.GetAccessControl(pathVersioningDat);
   fSecurity.SetAccessRule(rule);
   File.SetAccessControl(pathVersioningDat, fSecurity);

```

I know it works in several computers. It doesn´t work in any W7 Starter Editions and neither, in some few cases, in other Windows 7 Editions.

The exception message (IdentityNotMappedException) is "Some or all identity references could not be translated". Seems like "everyone" user cannot be found in these computers, but I'm not sure. It occurs at System.Security.Principal.NTAAccount.Translate method.

Any help?