[System.Security.SecurityCritical]
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        private void Init(String fileName, bool checkHost)
        {
            OriginalPath = fileName;
            // Must fully qualify the path for the security check
            String fullPath = Path.GetFullPathInternal(fileName);
#if FEATURE_CORECLR
            if (checkHost)
            {
                FileSecurityState state = new FileSecurityState(FileSecurityStateAccess.Read, fileName, fullPath);
                state.EnsureState();
            }
#else
            FileIOPermission.QuickDemand(FileIOPermissionAccess.Read, fullPath, false, false);
#endif

            _name = Path.GetFileName(fileName);
            FullPath = fullPath;
            DisplayPath = GetDisplayPath(fileName);
        }