diff --git a/composeApp/build.gradle.kts b/composeApp/build.gradle.kts
index 1962e80..db71ab0 100644
--- a/composeApp/build.gradle.kts
+++ b/composeApp/build.gradle.kts
@@ -45,6 +45,7 @@ kotlin {
         desktopMain.dependencies {
             implementation(compose.desktop.currentOs)
             implementation(libs.kotlinx.coroutines.swing)
+            implementation(libs.com.formdev.flatlaf)
         }
     }
 }
diff --git a/composeApp/src/desktopMain/kotlin/moe/crx/overport/app/ComposeMain.kt b/composeApp/src/desktopMain/kotlin/moe/crx/overport/app/ComposeMain.kt
index fd9cf8a..627d5aa 100644
--- a/composeApp/src/desktopMain/kotlin/moe/crx/overport/app/ComposeMain.kt
+++ b/composeApp/src/desktopMain/kotlin/moe/crx/overport/app/ComposeMain.kt
@@ -13,6 +13,7 @@ import androidx.compose.ui.draganddrop.awtTransferable
 import androidx.compose.ui.window.Window
 import androidx.compose.ui.window.application
 import androidx.lifecycle.viewmodel.compose.viewModel
+import com.formdev.flatlaf.util.SystemFileChooser
 import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.launch
 import moe.crx.overport.app.composables.AppContent
@@ -24,7 +25,6 @@ import org.jetbrains.compose.resources.stringResource
 import overportapp.composeapp.generated.resources.Res
 import overportapp.composeapp.generated.resources.select_a_file
 import overportapp.composeapp.generated.resources.window_icon
-import java.awt.FileDialog
 import java.awt.Frame
 import java.awt.datatransfer.DataFlavor
 import java.io.*
@@ -97,23 +97,26 @@ fun main(args: Array<String>) = application {
             AppContent(
                 viewModel = viewModel,
                 openFile = {
-                    val fileDialog = FileDialog(Frame(), selectFileString, FileDialog.LOAD).apply {
-                        directory = lastOpenedDirectory
-                        isVisible = true
+                    val fileDialog = SystemFileChooser(selectFileString).apply {
+                        currentDirectory = File(lastOpenedDirectory)
+                        selectedFile = null
                     }
 
-                    val file = fileDialog.file?.let { File(fileDialog.directory).resolve(it) }
+                    val file = if (fileDialog.showOpenDialog(Frame()) != SystemFileChooser.APPROVE_OPTION) null else {
+                        fileDialog.selectedFile
+                    }
 
                     openFile(file)
                 },
                 saveFile = { name ->
-                    val fileDialog = FileDialog(Frame(), selectFileString, FileDialog.SAVE).apply {
-                        directory = lastOpenedDirectory
-                        file = name
-                        isVisible = true
+                    val fileDialog = SystemFileChooser(selectFileString).apply {
+                        currentDirectory = File(lastOpenedDirectory)
+                        selectedFile = File(lastOpenedDirectory, name)
                     }
 
-                    val file = fileDialog.file?.let { File(fileDialog.directory).resolve(it) }
+                    val file = if (fileDialog.showSaveDialog(Frame()) != SystemFileChooser.APPROVE_OPTION) null else {
+                        fileDialog.selectedFile
+                    }
 
                     scope.launch {
                         if (file == null) {
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 18d5cc8..d77412d 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -13,8 +13,11 @@ bcpkix = "1.83"
 kotlinx-serialization = "1.9.0"
 lifecycle-viewmodel-compose = "2.9.6"
 compose-hot-reload = "1.0.0"
+flatlaf = "3.7.2"
 
 [libraries]
+com-formdev-flatlaf = { group = "com.formdev", name = "flatlaf", version.ref = "flatlaf" }
+
 androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "androidx-activityCompose" }
 
 androidx-lifecycle-viewmodel = { group = "org.jetbrains.androidx.lifecycle", name = "lifecycle-viewmodel", version.ref = "androidx-lifecycle" }
@@ -24,8 +27,8 @@ androidx-lifecycle-viewmodel-compose = { group = "org.jetbrains.androidx.lifecyc
 
 android-tools-build = { group = "com.android.tools.build", name = "apksig", version.ref = "apksig" }
 bouncycastle-pkix = { group = "org.bouncycastle", name = "bcpkix-jdk18on", version.ref = "bcpkix" }
-kotlinx-serialization-json = { group = "org.jetbrains.kotlinx", name ="kotlinx-serialization-json", version.ref = "kotlinx-serialization" }
-kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name ="kotlinx-coroutines-core", version.ref = "kotlinx-coroutines" }
+kotlinx-serialization-json = { group = "org.jetbrains.kotlinx", name = "kotlinx-serialization-json", version.ref = "kotlinx-serialization" }
+kotlinx-coroutines-core = { group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version.ref = "kotlinx-coroutines" }
 
 [plugins]
 androidApplication = { id = "com.android.application", version.ref = "agp" }