diff --git a/App.xaml.cs b/App.xaml.cs
index 4a72634..0e8f6c4 100644
--- a/App.xaml.cs
+++ b/App.xaml.cs
@@ -30,7 +30,7 @@ public static string BuildConfig { get {
         public static Version Version => System.Reflection.Assembly.GetExecutingAssembly().GetName().Version;
         public static readonly HashSet<string> ImageExtensions =
             new HashSet<string>(new[] {
-                ".jpg", ".jpeg", ".png", ".tiff", ".tif", ".gif", ".bmp", ".ico", ".dds", ".jxr", ".hdp", ".wdp", ".heic", "heif"
+                ".jpg", ".jpeg", ".png", ".tiff", ".tif", ".gif", ".bmp", ".ico", ".dds", ".jxr", ".hdp", ".wdp", ".heic", ".heif"
             });
         public static readonly HashSet<string> ZipExtensions =
             new HashSet<string>(new[] {
@@ -78,6 +78,13 @@ private void App_Startup(object sender, StartupEventArgs e) {
                 //handle setting changes
                 Setting.StaticPropertyChanged += Setting_StaticPropertyChanged;
 
+                //add custom extensions
+                foreach (var ext in Setting.CustomImageExt?.Split(' ')
+                    .Where(s => !string.IsNullOrWhiteSpace(s))
+                    .Select(s => '.' + s.Trim('.').ToLowerInvariant())) {
+                    if (!ImageExtensions.Contains(ext)) ImageExtensions.Add(ext);
+                }
+
                 //check arguments
                 if (e.Args?.Length > 0) {
 #if DEBUG
diff --git a/Helpers/Setting.cs b/Helpers/Setting.cs
index f142e12..8482568 100644
--- a/Helpers/Setting.cs
+++ b/Helpers/Setting.cs
@@ -97,6 +97,18 @@ private enum ConfigSection
         private static string sevenZipDllPath => Path.Combine(App.ExeDir, $@"7z_{(Environment.Is64BitProcess ? @"x64" : @"x86")}.dll");
 
 
+        private static string customImageExt = string.Empty;
+        [AppConfig]
+        public static string CustomImageExt
+        {
+            get => customImageExt;
+            set {
+                if (customImageExt == value) return;
+                customImageExt = value;
+                OnStaticPropertyChanged(nameof(CustomImageExt));
+            }
+        }
+
         private static string databaseDir = @".\";
         [AppConfig]
         public static string DatabaseDir {
diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index f3cda7b..578d5a2 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -148,6 +148,9 @@ private void MainWin_KeyDown(object sender, KeyEventArgs e) {
                 case Key.PageUp:
                     virWrapPanel.ScrollOwner.PageUp();
                     break;
+                case Key.F5:
+                    Task.Run(() => LoadPath(CurrentPath));
+                    break;
             }
         }
 
diff --git a/Properties/AssemblyInfo.cs b/Properties/AssemblyInfo.cs
index 3bbf51a..671f5f3 100644
--- a/Properties/AssemblyInfo.cs
+++ b/Properties/AssemblyInfo.cs
@@ -51,5 +51,5 @@
 // You can specify all the values or you can default the Build and Revision Numbers
 // by using the '*' as shown below:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.2.9.0")]
-[assembly: AssemblyFileVersion("1.2.9.0")]
+[assembly: AssemblyVersion("1.2.10.0")]
+[assembly: AssemblyFileVersion("1.2.10.0")]
diff --git a/Resources/Localization.en.xaml b/Resources/Localization.en.xaml
index d0132f5..c9e4400 100644
--- a/Resources/Localization.en.xaml
+++ b/Resources/Localization.en.xaml
@@ -16,6 +16,13 @@
     <sys:String x:Key="ttl_ThumbnailFormat">Thumbnail Format</sys:String>
     <sys:String x:Key="ttl_ThumbSwapDelayMultiplier">Thumbnail Swap Delay Multiplier</sys:String>
     <sys:String x:Key="msg_ThumbSwapDelayMultiplierTip">The delay of thumbnail change on folders and archives. Higher value results in longer delay.</sys:String>
+    <sys:String x:Key="ttl_CustomImageExt">Custom Image Extensions</sys:String>
+    <Span x:Key="spn_CustomImageExt">
+        Space-separated list of additional image extensions to load as images.
+        Whether the additional formats can be loaded depends on the operating system support.
+        Restart the program for this setting to take effect.<LineBreak/>
+        For example: .abc .def .ghi
+    </Span>
     <sys:String x:Key="ttl_DatabaseDir">Database Directory</sys:String>
     <sys:String x:Key="msg_DatabaseDirTip">The folder to save the all database files (thumbnail cache etc.).</sys:String>
     <sys:String x:Key="ttl_ThumbDbSize">Thumbnail Cache Size (Current: {0})</sys:String>
diff --git a/Resources/Localization.zh.xaml b/Resources/Localization.zh.xaml
index dd10340..70acc8d 100644
--- a/Resources/Localization.zh.xaml
+++ b/Resources/Localization.zh.xaml
@@ -16,6 +16,13 @@
     <sys:String x:Key="ttl_ThumbnailFormat">缩略图格式</sys:String>
     <sys:String x:Key="ttl_ThumbSwapDelayMultiplier">缩略图切换延迟速率</sys:String>
     <sys:String x:Key="msg_ThumbSwapDelayMultiplierTip">目录和压缩文件缩略图的切换延迟。数值越高延迟越高。</sys:String>
+    <sys:String x:Key="ttl_CustomImageExt">自定义图片扩展名</sys:String>
+    <Span x:Key="spn_CustomImageExt">
+        定义要作为图像加载的文件扩展名，以空格分隔。
+        图片格式是否支持取决于操作系统。
+        需要重启程序生效。<LineBreak/>
+        例如：.abc .def .ghi
+    </Span>
     <sys:String x:Key="ttl_DatabaseDir">数据库目录</sys:String>
     <sys:String x:Key="msg_DatabaseDirTip">存放数据库文件（缩略图缓存数据库等）的目录</sys:String>
     <sys:String x:Key="ttl_ThumbDbSize">缩略图缓存大小 （当前: {0}）</sys:String>
diff --git a/SettingsWindow.xaml b/SettingsWindow.xaml
index 715a4f2..6261eef 100644
--- a/SettingsWindow.xaml
+++ b/SettingsWindow.xaml
@@ -39,6 +39,7 @@
                 <RowDefinition Height="Auto"/>
                 <RowDefinition Height="Auto"/>
                 <RowDefinition Height="Auto"/>
+                <RowDefinition Height="Auto"/>
                 <RowDefinition Height="3*"/>
                 <RowDefinition Height="2*"/>
                 <RowDefinition Height="Auto"/>
@@ -108,6 +109,18 @@
             <TextBlock Grid.Row="1" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ThumbSwapDelayMultiplierTip}"/>
 
             <Border Grid.Row="2">
+                <StackPanel>
+                    <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_CustomImageExt}"/>
+                    <ContentControl>
+                        <TextBox x:Name="TB_CustomImageExt" Text="{Binding Source={x:Static local:App.Setting}, Path=CustomImageExt}"/>
+                    </ContentControl>
+                </StackPanel>
+            </Border>
+            <TextBlock Grid.Row="2" Grid.Column="1" Style="{StaticResource TipTextStyle}">
+                <StaticResource ResourceKey="spn_CustomImageExt"/>
+            </TextBlock>
+
+            <Border Grid.Row="3">
                 <StackPanel>
                     <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_DatabaseDir}"/>
                     <DockPanel>
@@ -118,9 +131,9 @@
                     </DockPanel>
                 </StackPanel>
             </Border>
-            <TextBlock Grid.Row="2" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_DatabaseDirTip}"/>
+            <TextBlock Grid.Row="3" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_DatabaseDirTip}"/>
 
-            <Border Grid.Row="3">
+            <Border Grid.Row="4">
                 <DockPanel>
                     <Button DockPanel.Dock="Right" Margin="8 0 0 0" VerticalAlignment="Top" Content="{StaticResource ttl_Clean}" Click="Btn_Clean_Click"/>
 
@@ -146,18 +159,18 @@
                     </StackPanel>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="3" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ThumbDbSizeTip}"/>
+            <TextBlock Grid.Row="4" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ThumbDbSizeTip}"/>
 
-            <Border Grid.Row="4">
+            <Border Grid.Row="5">
                 <DockPanel LastChildFill="False">
                     <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_LiteMode}" Margin="0" VerticalAlignment="Center"/>
                     <CheckBox Width="48" Height="24" VerticalAlignment="Center" DockPanel.Dock="Right"
                               IsChecked="{Binding Source={x:Static local:App.Setting}, Path=LiteMode}"/>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="4" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_LiteModeTip}"/>
+            <TextBlock Grid.Row="5" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_LiteModeTip}"/>
 
-            <Border Grid.Row="5">
+            <Border Grid.Row="6">
                 <DockPanel LastChildFill="False">
                     <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_ViewerBackground}" Margin="0" VerticalAlignment="Center"/>
                     <ContentControl DockPanel.Dock="Right">
@@ -168,7 +181,7 @@
                 </DockPanel>
             </Border>
 
-            <Border Grid.Row="6">
+            <Border Grid.Row="7">
                 <Grid>
                     <Grid.ColumnDefinitions>
                         <ColumnDefinition/>
@@ -196,18 +209,18 @@
                     </StackPanel>
                 </Grid>
             </Border>
-            <TextBlock Grid.Row="6" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ViewerTransitionTip}"/>
+            <TextBlock Grid.Row="7" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ViewerTransitionTip}"/>
 
-            <Border Grid.Row="7">
+            <Border Grid.Row="8">
                 <DockPanel LastChildFill="False">
                     <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_ExpMenuSlideshow}" Margin="0" VerticalAlignment="Center"/>
                     <CheckBox Width="48" Height="24" VerticalAlignment="Center" DockPanel.Dock="Right"
                               IsChecked="{Binding Source={x:Static local:App.Setting}, Path=ExpMenuSlideshow}"/>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="7" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ExpMenuSlideshow}"/>
+            <TextBlock Grid.Row="8" Grid.Column="1" Style="{StaticResource TipTextStyle}" Text="{StaticResource msg_ExpMenuSlideshow}"/>
 
-            <Border Grid.Row="8">
+            <Border Grid.Row="9">
                 <DockPanel LastChildFill="False">
                     <TextBlock Style="{StaticResource HeaderTextStyle}" Text="{StaticResource ttl_MasterPassword}" Margin="0" VerticalAlignment="Center"/>
                     <Button DockPanel.Dock="Left" Margin="8 0 0 0" Content="{StaticResource ttl_Password}" ContentStringFormat="{StaticResource ttl_Update_0}" VerticalAlignment="Center" Click="Btn_ChgMstPwd_Click"
@@ -216,11 +229,11 @@
                               IsChecked="{Binding Source={x:Static local:App.Setting}, Path=EncryptPasswords, Converter={StaticResource NullableBoolConverter}}"/>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="8" Grid.Column="1" Style="{StaticResource TipTextStyle}">
+            <TextBlock Grid.Row="9" Grid.Column="1" Style="{StaticResource TipTextStyle}">
                 <StaticResource ResourceKey="spn_MasterPasswordTip"/>
             </TextBlock>
 
-            <Border Grid.Row="9">
+            <Border Grid.Row="10">
                 <DockPanel>
                     <TextBlock Style="{StaticResource HeaderTextStyle}" DockPanel.Dock="Top" Text="{StaticResource ttl_SavedPasswords}"/>
                     <TabControl>
@@ -248,11 +261,11 @@
                     </TabControl>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="9" Grid.Column="1" Style="{StaticResource TipTextStyle}">
+            <TextBlock Grid.Row="10" Grid.Column="1" Style="{StaticResource TipTextStyle}">
                 <StaticResource ResourceKey="spn_SavedPasswordsTip"/>
             </TextBlock>
 
-            <Border Grid.Row="10" Margin="8 4 8 8">
+            <Border Grid.Row="11" Margin="8 4 8 8">
                 <DockPanel>
                     <TextBlock Style="{StaticResource HeaderTextStyle}" DockPanel.Dock="Top" Text="{StaticResource ttl_CustomCommands}"/>
                     <ContentControl HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
@@ -268,11 +281,11 @@
                     </ContentControl>
                 </DockPanel>
             </Border>
-            <TextBlock Grid.Row="10" Grid.Column="1" Style="{StaticResource TipTextStyle}">
+            <TextBlock Grid.Row="11" Grid.Column="1" Style="{StaticResource TipTextStyle}">
                 <StaticResource ResourceKey="spn_CustomCommandsTip"/>
             </TextBlock>
 
-            <TextBlock Grid.Row="11" Grid.ColumnSpan="2">
+            <TextBlock Grid.Row="12" Grid.ColumnSpan="2">
                 <StaticResource ResourceKey="spn_About"/>
             </TextBlock>
         </local:PaddedGrid>