diff --git a/src/gui_qt/io/filedialog.py b/src/gui_qt/io/filedialog.py
index 8340e72..6134d00 100644
--- a/src/gui_qt/io/filedialog.py
+++ b/src/gui_qt/io/filedialog.py
@@ -50,12 +50,12 @@ class FileDialog(QtWidgets.QFileDialog):
     def is_valid(filename: str):
         return True
 
-        bad_character = r'/*<>\|:"'
-        for c in bad_character:
-            if c in filename:
-                return False
-
-        return True
+        # bad_character = r'/*<>\|:"'
+        # for c in bad_character:
+        #     if c in filename:
+        #         return False
+        #
+        # return True
 
     def close(self):
         FileDialog.last_path = self.directory()
diff --git a/src/gui_qt/main/mainwindow.py b/src/gui_qt/main/mainwindow.py
index 19877d5..a4fa995 100644
--- a/src/gui_qt/main/mainwindow.py
+++ b/src/gui_qt/main/mainwindow.py
@@ -18,7 +18,7 @@ from ..fit.result import QFitResult
 from ..graphs.graphwindow import QGraphWindow
 from ..graphs.movedialog import QMover
 from ..io.fcbatchreader import QFCReader
-from ..io.filedialog import OpenFileDialog, SaveDirectoryDialog
+from ..io.filedialog import *
 from ..lib import get_icon, make_action_icons
 from ..lib.pg_objects import RegionItem
 from ..math.evaluation import QEvalDialog
@@ -277,8 +277,10 @@ class NMRMainWindow(QtWidgets.QMainWindow, Ui_BaseWindow):
     @QtCore.pyqtSlot()
     @QtCore.pyqtSlot(list)
     def save_fit_parameter(self, fit_sets: list[str] = None):
-        save_dialog = SaveDirectoryDialog(parent=self, caption='Save fit parameter', directory=str(self.path),
-                                          filter='All files(*, *);;Text files(*.dat *.txt)')
+        save_dialog = FileDialog(parent=self, caption='Save fit parameter', directory=str(self.path),
+                                 filter='All files(*, *);;Text files(*.dat *.txt)')
+        save_dialog.setAcceptMode(FileDialog.AcceptSave)
+        save_dialog.setOption(QtWidgets.QFileDialog.DontConfirmOverwrite, True)
 
         mode = save_dialog.exec()
         if mode == QtWidgets.QDialog.Accepted:
diff --git a/src/gui_qt/main/management.py b/src/gui_qt/main/management.py
index 8c4c8b5..94657b9 100644
--- a/src/gui_qt/main/management.py
+++ b/src/gui_qt/main/management.py
@@ -3,7 +3,6 @@ from __future__ import annotations
 import pathlib
 import re
 import uuid
-from typing import List
 
 from nmreval.fit import data as fit_d
 from nmreval.fit.model import Model
@@ -154,7 +153,7 @@ class UpperManagement(QtCore.QObject):
 
         return _id
 
-    def load_files(self, fname: List[str], new_plot: str = None):
+    def load_files(self, fname: list[str], new_plot: str = None):
         if self._filereader is None:
             self._filereader = QFileReader(manager=self)
         ret_dic = self._filereader.readfiles(fname)
@@ -546,7 +545,7 @@ class UpperManagement(QtCore.QObject):
 
         self.newData.emit(f_id_list, gid)
 
-    def make_fit_parameter(self, fit_sets: List[str | FitResult], graph_id: str = None):
+    def make_fit_parameter(self, fit_sets: list[str | FitResult], graph_id: str = None):
         fit_dict = self._collect_fit_parameter(fit_sets)
 
         if fit_dict:
@@ -560,7 +559,7 @@ class UpperManagement(QtCore.QObject):
 
             self.newData.emit(p_id_list, graph_id)
 
-    def save_fit_parameter(self, fname: str | pathlib.Path, fit_sets: List[str] = None):
+    def save_fit_parameter(self, fname: str | pathlib.Path, fit_sets: list[str] = None):
         if fit_sets is None:
             fit_sets = [s for (s, _) in self.active_sets]
 
@@ -571,7 +570,7 @@ class UpperManagement(QtCore.QObject):
 
             data.data.save_parameter(fname)
 
-    def _collect_fit_parameter(self, fit_sets: List[str | FitResult]) -> dict:
+    def _collect_fit_parameter(self, fit_sets: list[str | FitResult]) -> dict:
         fit_dict = {}
 
         for set_id in fit_sets: