@@ -15,7 +15,12 @@ const Prefix = `\\?\`

 // it does not already have it.

 func AddPrefix(path string) string {

 	if !strings.HasPrefix(path, Prefix) {

-		path = Prefix + path

+		if strings.HasPrefix(path, `\\`) {

+			// This is a UNC path, so we need to add 'UNC' to the path as well.

+			path = Prefix + `UNC` + path[1:]

+		} else {

+			path = Prefix + path

+		}

 	}

 	return path

 }

new file mode 100644

@@ -0,0 +1,22 @@

+package longpath

+

+import (

+	"strings"

+	"testing"

+)

+

+func TestStandardLongPath(t *testing.T) {

+	c := `C:\simple\path`

+	longC := AddPrefix(c)

+	if !strings.EqualFold(longC, `\\?\C:\simple\path`) {

+		t.Errorf("Wrong long path returned. Original = %s ; Long = %s", c, longC)

+	}

+}

+

+func TestUNCLongPath(t *testing.T) {

+	c := `\\server\share\path`

+	longC := AddPrefix(c)

+	if !strings.EqualFold(longC, `\\?\UNC\server\share\path`) {

+		t.Errorf("Wrong UNC long path returned. Original = %s ; Long = %s", c, longC)

+	}

+}