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copied!<p>Below is the code sample I used. It works in my application and in my environment. Should work in others. Sorry this was not posted sooner, was new to StackOverFlow. I hope this posts properly.</p> <pre><code>public class GetUserInfo{ private const int NAME_SIZE = 0x40; // Methods [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] private static extern bool ConvertSidToStringSid(IntPtr Sid, ref IntPtr StringSid); public string ConvertSidToStringSidNT(IntPtr Sid) { string ans = string.Empty; if (IsValidSid(Sid)) { ans = "S-1-"; SID_IDENTIFIER_AUTHORITY psia = (SID_IDENTIFIER_AUTHORITY) Marshal.PtrToStructure(GetSidIdentifierAuthority(Sid), typeof(SID_IDENTIFIER_AUTHORITY)); int num = Marshal.ReadInt16(GetSidSubAuthorityCount(Sid)); if ((psia.Value[0] != 0) & (psia.Value[1] != 0)) { ans = ((ans + Conversion.Hex(psia.Value[0]) + Conversion.Hex(psia.Value[1]).PadLeft(2, '0')) + Conversion.Hex(psia.Value[2]).PadLeft(2, '0') + Conversion.Hex(psia.Value[3]).PadLeft(2, '0')) + Conversion.Hex(psia.Value[4]).PadLeft(2, '0') + Conversion.Hex(psia.Value[5]).PadLeft(2, '0'); } else { long top = psia.Value[5]; top += psia.Value[4] * 0x100; top += (psia.Value[3] * 0x100) * 0x100; ans = ans + ((top + (((psia.Value[2] * 0x100) * 0x100) * 0x100))).ToString(); } int VB$t_i4$L0 = num - 1; for (int i = 0; i <= VB$t_i4$L0; i++) { ans = ans + "-" + Marshal.ReadInt32(GetSidSubAuthority(Sid, i)).ToString(); } } return ans; } public string GetFileOwner(string Path) { string MachineName; IntPtr OwnerSid; int peUse; IntPtr SD; string UserName; IntPtr VB$t_struct$N0; SE_OBJECT_TYPE ObjectType = SE_OBJECT_TYPE.SE_FILE_OBJECT; if (GetNamedSecurityInfo(ref Path, ObjectType, SECURITY_INFORMATION.OWNER_SECURITY_INFORMATION, ref OwnerSid, ref VB$t_struct$N0, ref VB$t_struct$N0, ref VB$t_struct$N0, ref SD) != 0) { return "Error"; } Marshal.FreeHGlobal(SD); if (Path.StartsWith(@"\\")) { MachineName = Path.Split(new char[] { '\\' })[2]; } else { MachineName = ""; } int name_len = 0x40; int domain_len = 0x40; string name = Strings.Space(name_len); string domain_name = Strings.Space(domain_len); if (!LookupAccountSid(ref MachineName, OwnerSid, ref name, ref name_len, ref domain_name, ref domain_len, ref peUse)) { string SidString; if (Marshal.GetLastWin32Error() != 0x534) { return "Error"; } if (Environment.Version.Major == 4) { SidString = this.ConvertSidToStringSidNT(OwnerSid); } else { IntPtr StringPtr; if (!ConvertSidToStringSid(OwnerSid, ref StringPtr)) { return "Error"; } SidString = Marshal.PtrToStringAuto(StringPtr); Marshal.FreeHGlobal(StringPtr); } domain_len = 0; name = SidString; name_len = Strings.Len(name); } if (domain_len > 0) { UserName = Strings.Left(name, name_len); } else { UserName = Strings.Left(name, name_len); } return UserName; } [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] private static extern int GetNamedSecurityInfo([MarshalAs(UnmanagedType.VBByRefStr)] ref string pObjectName, SE_OBJECT_TYPE ObjectType, SECURITY_INFORMATION SecurityInfo, ref IntPtr ppsidOwner, ref IntPtr ppsidGroup, ref IntPtr ppDacl, ref IntPtr ppSacl, ref IntPtr ppSecurityDescriptor); [DllImport("advapi32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)] private static extern IntPtr GetSidIdentifierAuthority(IntPtr pSid); [DllImport("advapi32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)] private static extern IntPtr GetSidSubAuthority(IntPtr pSid, int nSubAuthority); [DllImport("advapi32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)] private static extern IntPtr GetSidSubAuthorityCount(IntPtr pSid); [DllImport("advapi32.dll", CharSet=CharSet.Ansi, SetLastError=true, ExactSpelling=true)] private static extern bool IsValidSid(IntPtr pSid); [DllImport("advapi32.dll", CharSet=CharSet.Auto, SetLastError=true)] private static extern bool LookupAccountSid([MarshalAs(UnmanagedType.VBByRefStr)] ref string lpSystemName, IntPtr lpSid, [MarshalAs(UnmanagedType.VBByRefStr)] ref string lpName, ref int cchName, [MarshalAs(UnmanagedType.VBByRefStr)] ref string lpReferenceDomainName, ref int cchReferencedDomainName, ref int peUse); // Nested Types private enum SE_OBJECT_TYPE { SE_UNKNOWN_OBJECT_TYPE, SE_FILE_OBJECT, SE_SERVICE, SE_PRINTER, SE_REGISTRY_KEY, SE_LMSHARE, SE_KERNEL_OBJECT, SE_WINDOW_OBJECT, SE_DS_OBJECT, SE_DS_OBJECT_ALL, SE_PROVIDER_DEFINED_OBJECT, SE_WMIGUID_OBJECT, SE_REGISTRY_WOW64_32 } private enum SECURITY_INFORMATION { DACL_SECURITY_INFORMATION = 4, GROUP_SECURITY_INFORMATION = 2, OWNER_SECURITY_INFORMATION = 1, PROTECTED_DACL_SECURITY_INFORMATION = 0x20, PROTECTED_SACL_SECURITY_INFORMATION = 0x10, SACL_SECURITY_INFORMATION = 8, UNPROTECTED_DACL_SECURITY_INFORMATION = 0x80, UNPROTECTED_SACL_SECURITY_INFORMATION = 0x40 } [StructLayout(LayoutKind.Sequential)] private struct SID_IDENTIFIER_AUTHORITY { [MarshalAs(UnmanagedType.ByValArray, SizeConst=6)] public byte[] Value; } } </code></pre>

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