diff --git a/tun/tun_windows.go b/tun/tun_windows.go
index d22e130..21bc382 100644
--- a/tun/tun_windows.go
+++ b/tun/tun_windows.go
@@ -146,13 +146,17 @@ func CreateTUNWithRequestedGUID(ifname string, requestedGUID *windows.GUID) (Dev
 }
 
 func (tun *NativeTun) openTUN() error {
+	filename, err := tun.wt.NdisFileName()
+	if err != nil {
+		return err
+	}
+
 	retries := maybeRetry(retryTimeout * retryRate)
 	if tun.close {
 		return os.ErrClosed
 	}
 
-	var err error
-	name, err := windows.UTF16PtrFromString(tun.wt.DataFileName())
+	name, err := windows.UTF16PtrFromString(filename)
 	if err != nil {
 		return err
 	}
diff --git a/tun/wintun/wintun_windows.go b/tun/wintun/wintun_windows.go
index 160d51f..e8eadf5 100644
--- a/tun/wintun/wintun_windows.go
+++ b/tun/wintun/wintun_windows.go
@@ -612,11 +612,6 @@ func (wintun *Wintun) deviceData() (setupapi.DevInfo, *setupapi.DevInfoData, err
 	return 0, nil, windows.ERROR_OBJECT_NOT_FOUND
 }
 
-// DataFileName returns the Wintun device data pipe name.
-func (wintun *Wintun) DataFileName() string {
-	return fmt.Sprintf("\\\\.\\Global\\WINTUN%d", wintun.luidIndex)
-}
-
 // NdisFileName returns the Wintun NDIS device object name.
 func (wintun *Wintun) NdisFileName() (string, error) {
 	key, err := registry.OpenKey(registry.LOCAL_MACHINE, wintun.netRegKeyName(), registry.QUERY_VALUE)