diff --git a/web/src/main/kotlin/world/phantasmal/web/core/files/FilesExtensions.kt b/web/src/main/kotlin/world/phantasmal/web/core/files/FilesExtensions.kt
new file mode 100644
index 00000000..c4861cad
--- /dev/null
+++ b/web/src/main/kotlin/world/phantasmal/web/core/files/FilesExtensions.kt
@@ -0,0 +1,9 @@
+package world.phantasmal.web.core.files
+
+import world.phantasmal.lib.Endianness
+import world.phantasmal.lib.cursor.Cursor
+import world.phantasmal.lib.cursor.cursor
+import world.phantasmal.webui.files.FileHandle
+
+suspend fun FileHandle.cursor(endianness: Endianness): Cursor =
+    arrayBuffer().cursor(endianness)
diff --git a/web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarController.kt b/web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarController.kt
index f7e53f0b..814ccb50 100644
--- a/web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarController.kt
+++ b/web/src/main/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarController.kt
@@ -5,17 +5,16 @@ import mu.KotlinLogging
 import org.w3c.dom.HTMLAnchorElement
 import org.w3c.dom.url.URL
 import org.w3c.files.Blob
-import org.w3c.files.File
 import world.phantasmal.core.*
 import world.phantasmal.lib.Endianness
 import world.phantasmal.lib.Episode
-import world.phantasmal.lib.cursor.cursor
 import world.phantasmal.lib.fileFormats.quest.*
 import world.phantasmal.observable.value.Val
 import world.phantasmal.observable.value.map
 import world.phantasmal.observable.value.mutableVal
 import world.phantasmal.observable.value.value
 import world.phantasmal.web.core.PwToolType
+import world.phantasmal.web.core.files.cursor
 import world.phantasmal.web.core.stores.UiStore
 import world.phantasmal.web.questEditor.models.AreaModel
 import world.phantasmal.web.questEditor.stores.AreaStore
@@ -23,9 +22,10 @@ import world.phantasmal.web.questEditor.stores.QuestEditorStore
 import world.phantasmal.web.questEditor.stores.convertQuestFromModel
 import world.phantasmal.web.questEditor.stores.convertQuestToModel
 import world.phantasmal.webui.controllers.Controller
+import world.phantasmal.webui.files.FileHandle
+import world.phantasmal.webui.files.FileType
+import world.phantasmal.webui.files.showFilePicker
 import world.phantasmal.webui.obj
-import world.phantasmal.webui.readFile
-import world.phantasmal.webui.selectFiles
 
 private val logger = KotlinLogging.logger {}
 
@@ -47,7 +47,12 @@ class QuestEditorToolbarController(
     val resultDialogVisible: Val<Boolean> = _resultDialogVisible
     val result: Val<PwResult<*>?> = _result
 
-    val openFileAccept = ".bin, .dat, .qst"
+    val supportedFileTypes = listOf(
+        FileType(
+            description = "Quests",
+            accept = mapOf("application/pw-quest" to setOf(".qst", ".bin", ".dat")),
+        ),
+    )
 
     // Save as
 
@@ -101,7 +106,7 @@ class QuestEditorToolbarController(
     init {
         addDisposables(
             uiStore.onGlobalKeyDown(PwToolType.QuestEditor, "Ctrl-O") {
-                openFiles(selectFiles(accept = openFileAccept, multiple = true))
+                openFiles(showFilePicker(supportedFileTypes, multiple = true))
             },
 
             uiStore.onGlobalKeyDown(PwToolType.QuestEditor, "Ctrl-Shift-S") {
@@ -128,26 +133,26 @@ class QuestEditorToolbarController(
         questEditorStore.setDefaultQuest(episode)
     }
 
-    suspend fun openFiles(files: List<File>) {
+    suspend fun openFiles(files: List<FileHandle>?) {
         try {
-            if (files.isEmpty()) return
+            if (files.isNullOrEmpty()) return
 
-            val qst = files.find { it.name.endsWith(".qst", ignoreCase = true) }
+            val qstFile = files.find { it.extension().equals("qst", ignoreCase = true) }
 
-            if (qst != null) {
-                val parseResult = parseQstToQuest(readFile(qst).cursor(Endianness.Little))
+            if (qstFile != null) {
+                val parseResult = parseQstToQuest(qstFile.cursor(Endianness.Little))
                 setResult(parseResult)
 
                 if (parseResult is Success) {
-                    setFilename(filenameBase(qst.name) ?: qst.name)
+                    setFilename(filenameBase(qstFile.name) ?: qstFile.name)
                     setVersion(parseResult.value.version)
                     setCurrentQuest(parseResult.value.quest)
                 }
             } else {
-                val bin = files.find { it.name.endsWith(".bin", ignoreCase = true) }
-                val dat = files.find { it.name.endsWith(".dat", ignoreCase = true) }
+                val binFile = files.find { it.extension().equals("bin", ignoreCase = true) }
+                val datFile = files.find { it.extension().equals("dat", ignoreCase = true) }
 
-                if (bin == null || dat == null) {
+                if (binFile == null || datFile == null) {
                     setResult(Failure(listOf(Problem(
                         Severity.Error,
                         "Please select a .qst file or one .bin and one .dat file."
@@ -156,13 +161,13 @@ class QuestEditorToolbarController(
                 }
 
                 val parseResult = parseBinDatToQuest(
-                    readFile(bin).cursor(Endianness.Little),
-                    readFile(dat).cursor(Endianness.Little),
+                    binFile.cursor(Endianness.Little),
+                    datFile.cursor(Endianness.Little),
                 )
                 setResult(parseResult)
 
                 if (parseResult is Success) {
-                    setFilename(filenameBase(bin.name) ?: filenameBase(dat.name) ?: bin.name)
+                    setFilename(binFile.basename() ?: datFile.basename() ?: binFile.name)
                     setVersion(Version.BB)
                     setCurrentQuest(parseResult.value)
                 }
diff --git a/web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/QuestEditorToolbarWidget.kt b/web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/QuestEditorToolbarWidget.kt
index d5c5d319..3b9f77b2 100644
--- a/web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/QuestEditorToolbarWidget.kt
+++ b/web/src/main/kotlin/world/phantasmal/web/questEditor/widgets/QuestEditorToolbarWidget.kt
@@ -30,7 +30,7 @@ class QuestEditorToolbarWidget(private val ctrl: QuestEditorToolbarController) :
                         text = "Open file...",
                         tooltip = value("Open a quest file (Ctrl-O)"),
                         iconLeft = Icon.File,
-                        accept = ctrl.openFileAccept,
+                        types = ctrl.supportedFileTypes,
                         multiple = true,
                         filesSelected = { files -> scope.launch { ctrl.openFiles(files) } },
                     ),
diff --git a/web/src/main/kotlin/world/phantasmal/web/viewer/Viewer.kt b/web/src/main/kotlin/world/phantasmal/web/viewer/Viewer.kt
index 9bf822d8..5f6b8d4f 100644
--- a/web/src/main/kotlin/world/phantasmal/web/viewer/Viewer.kt
+++ b/web/src/main/kotlin/world/phantasmal/web/viewer/Viewer.kt
@@ -16,7 +16,7 @@ import world.phantasmal.web.viewer.rendering.MeshRenderer
 import world.phantasmal.web.viewer.rendering.TextureRenderer
 import world.phantasmal.web.viewer.stores.ViewerStore
 import world.phantasmal.web.viewer.widgets.CharacterClassOptionsWidget
-import world.phantasmal.web.viewer.widgets.ViewerToolbar
+import world.phantasmal.web.viewer.widgets.ViewerToolbarWidget
 import world.phantasmal.web.viewer.widgets.ViewerWidget
 import world.phantasmal.webui.DisposableContainer
 import world.phantasmal.webui.widgets.Widget
@@ -54,7 +54,7 @@ class Viewer(
         // Main Widget
         return ViewerWidget(
             viewerController,
-            { ViewerToolbar(viewerToolbarController) },
+            { ViewerToolbarWidget(viewerToolbarController) },
             { CharacterClassOptionsWidget(characterClassOptionsController) },
             { RendererWidget(meshRenderer) },
             { RendererWidget(textureRenderer) },
diff --git a/web/src/main/kotlin/world/phantasmal/web/viewer/controllers/ViewerToolbarController.kt b/web/src/main/kotlin/world/phantasmal/web/viewer/controllers/ViewerToolbarController.kt
index e88d6ba5..822badba 100644
--- a/web/src/main/kotlin/world/phantasmal/web/viewer/controllers/ViewerToolbarController.kt
+++ b/web/src/main/kotlin/world/phantasmal/web/viewer/controllers/ViewerToolbarController.kt
@@ -1,7 +1,6 @@
 package world.phantasmal.web.viewer.controllers
 
 import mu.KotlinLogging
-import org.w3c.files.File
 import world.phantasmal.core.Failure
 import world.phantasmal.core.PwResult
 import world.phantasmal.core.Severity
@@ -16,11 +15,11 @@ import world.phantasmal.lib.fileFormats.parseAreaCollisionGeometry
 import world.phantasmal.lib.fileFormats.parseAreaRenderGeometry
 import world.phantasmal.observable.value.Val
 import world.phantasmal.observable.value.mutableVal
+import world.phantasmal.web.core.files.cursor
 import world.phantasmal.web.viewer.stores.NinjaGeometry
 import world.phantasmal.web.viewer.stores.ViewerStore
 import world.phantasmal.webui.controllers.Controller
-import world.phantasmal.webui.extension
-import world.phantasmal.webui.readFile
+import world.phantasmal.webui.files.FileHandle
 
 private val logger = KotlinLogging.logger {}
 
@@ -70,7 +69,9 @@ class ViewerToolbarController(private val store: ViewerStore) : Controller() {
         store.setCurrentAnimation(null)
     }
 
-    suspend fun openFiles(files: List<File>) {
+    suspend fun openFiles(files: List<FileHandle>?) {
+        files ?: return
+
         val result = PwResult.build<Unit>(logger)
         var success = false
 
@@ -82,7 +83,7 @@ class ViewerToolbarController(private val store: ViewerStore) : Controller() {
             for (file in files) {
                 val extension = file.extension()?.toLowerCase()
 
-                val cursor = readFile(file).cursor(Endianness.Little)
+                val cursor = file.cursor(Endianness.Little)
                 var fileResult: PwResult<*>
 
                 when (extension) {
@@ -105,6 +106,7 @@ class ViewerToolbarController(private val store: ViewerStore) : Controller() {
                     }
 
                     "rel" -> {
+                        // TODO: Detect .rel type instead of relying on filename.
                         if (file.name.endsWith("c.rel")) {
                             val collisionGeometry = parseAreaCollisionGeometry(cursor)
                             fileResult = Success(collisionGeometry)
diff --git a/web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbar.kt b/web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbarWidget.kt
similarity index 84%
rename from web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbar.kt
rename to web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbarWidget.kt
index 04dcf717..08d133ef 100644
--- a/web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbar.kt
+++ b/web/src/main/kotlin/world/phantasmal/web/viewer/widgets/ViewerToolbarWidget.kt
@@ -5,9 +5,10 @@ import org.w3c.dom.Node
 import world.phantasmal.web.viewer.controllers.ViewerToolbarController
 import world.phantasmal.webui.dom.Icon
 import world.phantasmal.webui.dom.div
+import world.phantasmal.webui.files.FileType
 import world.phantasmal.webui.widgets.*
 
-class ViewerToolbar(private val ctrl: ViewerToolbarController) : Widget() {
+class ViewerToolbarWidget(private val ctrl: ViewerToolbarController) : Widget() {
     override fun Node.createElement() =
         div {
             className = "pw-viewer-toolbar"
@@ -17,7 +18,16 @@ class ViewerToolbar(private val ctrl: ViewerToolbarController) : Widget() {
                     FileButton(
                         text = "Open file...",
                         iconLeft = Icon.File,
-                        accept = ".afs, .nj, .njm, .rel, .xj, .xvm",
+                        types = listOf(
+                            FileType(
+                                description = "Models, textures, animations",
+                                accept = mapOf(
+                                    "application/pw-viewer-file" to setOf(
+                                        ".afs", ".nj", ".njm", ".rel", ".xj", ".xvm"
+                                    ),
+                                ),
+                            ),
+                        ),
                         multiple = true,
                         filesSelected = { files -> scope.launch { ctrl.openFiles(files) } },
                     ),
diff --git a/web/src/test/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarControllerTests.kt b/web/src/test/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarControllerTests.kt
index 4a73e726..4fb24595 100644
--- a/web/src/test/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarControllerTests.kt
+++ b/web/src/test/kotlin/world/phantasmal/web/questEditor/controllers/QuestEditorToolbarControllerTests.kt
@@ -9,6 +9,7 @@ import world.phantasmal.web.core.actions.Action
 import world.phantasmal.web.test.WebTestSuite
 import world.phantasmal.web.test.createQuestModel
 import world.phantasmal.web.test.createQuestNpcModel
+import world.phantasmal.webui.files.FileHandle
 import kotlin.test.*
 
 class QuestEditorToolbarControllerTests : WebTestSuite {
@@ -35,7 +36,7 @@ class QuestEditorToolbarControllerTests : WebTestSuite {
 
         assertNull(ctrl.result.value)
 
-        ctrl.openFiles(listOf(File(arrayOf(), "unknown.extension")))
+        ctrl.openFiles(listOf(FileHandle(File(arrayOf(), "unknown.extension"))))
 
         val result = ctrl.result.value
 
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/Files.kt b/webui/src/main/kotlin/world/phantasmal/webui/Files.kt
deleted file mode 100644
index 1c63aa39..00000000
--- a/webui/src/main/kotlin/world/phantasmal/webui/Files.kt
+++ /dev/null
@@ -1,38 +0,0 @@
-package world.phantasmal.webui
-
-import kotlinx.browser.document
-import kotlinx.coroutines.ExperimentalCoroutinesApi
-import kotlinx.coroutines.suspendCancellableCoroutine
-import org.khronos.webgl.ArrayBuffer
-import org.w3c.dom.HTMLInputElement
-import org.w3c.dom.asList
-import org.w3c.files.File
-import org.w3c.files.FileReader
-
-@OptIn(ExperimentalCoroutinesApi::class)
-suspend fun selectFiles(accept: String = "", multiple: Boolean = false): List<File> =
-    suspendCancellableCoroutine { cont ->
-        val el = document.createElement("input") as HTMLInputElement
-        el.type = "file"
-        el.accept = accept
-        el.multiple = multiple
-
-        el.onchange = {
-            cont.resume(el.files?.asList() ?: emptyList()) {}
-        }
-
-        el.click()
-    }
-
-@OptIn(ExperimentalCoroutinesApi::class)
-suspend fun readFile(file: File): ArrayBuffer = suspendCancellableCoroutine { cont ->
-    val reader = FileReader()
-    reader.onloadend = {
-        if (reader.result is ArrayBuffer) {
-            cont.resume(reader.result.unsafeCast<ArrayBuffer>()) {}
-        } else {
-            cont.cancel(Exception(reader.error.message.unsafeCast<String>()))
-        }
-    }
-    reader.readAsArrayBuffer(file)
-}
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/Js.kt b/webui/src/main/kotlin/world/phantasmal/webui/Js.kt
index 61f0a740..9e4edb7f 100644
--- a/webui/src/main/kotlin/world/phantasmal/webui/Js.kt
+++ b/webui/src/main/kotlin/world/phantasmal/webui/Js.kt
@@ -1,8 +1,13 @@
 package world.phantasmal.webui
 
+import kotlinx.browser.window
 import org.w3c.files.File
 import world.phantasmal.core.filenameExtension
 
+object BrowserFeatures {
+    val fileSystemApi: Boolean = window.asDynamic().showOpenFilePicker != null
+}
+
 inline fun <T> obj(block: T.() -> Unit): T =
     js("{}").unsafeCast<T>().apply(block)
 
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/externals/browser/Browser.kt b/webui/src/main/kotlin/world/phantasmal/webui/externals/browser/Browser.kt
new file mode 100644
index 00000000..47b67e2c
--- /dev/null
+++ b/webui/src/main/kotlin/world/phantasmal/webui/externals/browser/Browser.kt
@@ -0,0 +1,35 @@
+package world.phantasmal.webui.externals.browser
+
+import org.khronos.webgl.ArrayBuffer
+import org.w3c.dom.Window
+import org.w3c.files.Blob
+import org.w3c.files.File
+import kotlin.js.Promise
+
+fun Blob.arrayBuffer(): Promise<ArrayBuffer> =
+    asDynamic().arrayBuffer().unsafeCast<Promise<ArrayBuffer>>()
+
+open external class FileSystemHandle {
+    val kind: String /* "file" | "directory" */
+    val name: String
+}
+
+external class FileSystemFileHandle : FileSystemHandle {
+    fun getFile(): Promise<File>
+}
+
+external interface ShowOpenFilePickerOptionsType {
+    var description: String
+    var accept: dynamic
+}
+
+external interface ShowOpenFilePickerOptions {
+    var multiple: Boolean
+    var excludeAcceptAllOption: Boolean
+    var types: Array<ShowOpenFilePickerOptionsType>
+}
+
+fun Window.showOpenFilePicker(
+    options: ShowOpenFilePickerOptions,
+): Promise<Array<FileSystemFileHandle>> =
+    asDynamic().showOpenFilePicker(options).unsafeCast<Promise<Array<FileSystemFileHandle>>>()
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/files/Files.kt b/webui/src/main/kotlin/world/phantasmal/webui/files/Files.kt
new file mode 100644
index 00000000..3e95986a
--- /dev/null
+++ b/webui/src/main/kotlin/world/phantasmal/webui/files/Files.kt
@@ -0,0 +1,108 @@
+package world.phantasmal.webui.files
+
+import kotlinx.browser.document
+import kotlinx.browser.window
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.suspendCancellableCoroutine
+import org.khronos.webgl.ArrayBuffer
+import org.w3c.dom.HTMLInputElement
+import org.w3c.dom.asList
+import org.w3c.dom.events.Event
+import org.w3c.files.File
+import world.phantasmal.core.disposable.Disposable
+import world.phantasmal.core.filenameBase
+import world.phantasmal.core.filenameExtension
+import world.phantasmal.webui.BrowserFeatures
+import world.phantasmal.webui.dom.disposableListener
+import world.phantasmal.webui.externals.browser.FileSystemFileHandle
+import world.phantasmal.webui.externals.browser.ShowOpenFilePickerOptionsType
+import world.phantasmal.webui.externals.browser.arrayBuffer
+import world.phantasmal.webui.externals.browser.showOpenFilePicker
+import world.phantasmal.webui.obj
+import kotlin.js.Promise
+
+@OptIn(ExperimentalCoroutinesApi::class)
+class FileHandle private constructor(
+    private val handle: FileSystemFileHandle?,
+    private val file: File?,
+) {
+    constructor(file: File) : this(null, file)
+    constructor(handle: FileSystemFileHandle) : this(handle, null)
+
+    val name: String = handle?.name ?: file!!.name
+
+    init {
+        require((handle == null) xor (file == null))
+    }
+
+    /**
+     * Returns the filename without extension if there is one.
+     */
+    fun basename(): String? = filenameBase(name)
+
+    /**
+     * Returns the filename extension if there is one.
+     */
+    fun extension(): String? = filenameExtension(name)
+
+    suspend fun arrayBuffer(): ArrayBuffer = suspendCancellableCoroutine { cont ->
+        getFile()
+            .then { it.arrayBuffer() }
+            .then({ cont.resume(it) {} }, cont::cancel)
+    }
+
+    private fun getFile(): Promise<File> =
+        handle?.getFile() ?: Promise.resolve(file!!)
+}
+
+class FileType(
+    val description: String,
+    /**
+     * Map of MIME types to file extensions
+     */
+    val accept: Map<String, Set<String>>,
+)
+
+@OptIn(ExperimentalCoroutinesApi::class)
+suspend fun showFilePicker(types: List<FileType>, multiple: Boolean = false): List<FileHandle>? =
+    suspendCancellableCoroutine { cont ->
+        if (BrowserFeatures.fileSystemApi) {
+            window.showOpenFilePicker(obj {
+                this.multiple = multiple
+                this.types = types.map {
+                    obj<ShowOpenFilePickerOptionsType> {
+                        description = it.description
+                        accept = obj {
+                            for ((mimeType, extensions) in it.accept) {
+                                this[mimeType] = extensions.toTypedArray()
+                            }
+                        }
+                    }
+                }.toTypedArray()
+            }).then({ cont.resume(it.map(::FileHandle)) {} }, { cont.resume(null) {} })
+        } else {
+            val el = document.createElement("input") as HTMLInputElement
+            el.type = "file"
+            el.accept = types.flatMap { it.accept.values.flatten() }.joinToString()
+            el.multiple = multiple
+
+            el.onchange = {
+                cont.resume(el.files?.asList()?.map(::FileHandle) ?: emptyList()) {}
+            }
+
+            @Suppress("JoinDeclarationAndAssignment")
+            lateinit var focusListener: Disposable
+
+            focusListener = window.disposableListener<Event>("focus", {
+                focusListener.dispose()
+
+                window.setTimeout({
+                    if (cont.isActive) {
+                        cont.resume(null) {}
+                    }
+                }, 500)
+            })
+
+            el.click()
+        }
+    }
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/widgets/Dialog.kt b/webui/src/main/kotlin/world/phantasmal/webui/widgets/Dialog.kt
index affda425..37c408ec 100644
--- a/webui/src/main/kotlin/world/phantasmal/webui/widgets/Dialog.kt
+++ b/webui/src/main/kotlin/world/phantasmal/webui/widgets/Dialog.kt
@@ -16,6 +16,7 @@ import world.phantasmal.webui.dom.dom
 import world.phantasmal.webui.dom.h1
 import world.phantasmal.webui.dom.section
 
+// TODO: Use HTML dialog element.
 open class Dialog(
     visible: Val<Boolean> = trueVal(),
     enabled: Val<Boolean> = trueVal(),
diff --git a/webui/src/main/kotlin/world/phantasmal/webui/widgets/FileButton.kt b/webui/src/main/kotlin/world/phantasmal/webui/widgets/FileButton.kt
index d84ebb58..0b62e491 100644
--- a/webui/src/main/kotlin/world/phantasmal/webui/widgets/FileButton.kt
+++ b/webui/src/main/kotlin/world/phantasmal/webui/widgets/FileButton.kt
@@ -2,12 +2,13 @@ package world.phantasmal.webui.widgets
 
 import kotlinx.coroutines.launch
 import org.w3c.dom.HTMLElement
-import org.w3c.files.File
 import world.phantasmal.observable.value.Val
 import world.phantasmal.observable.value.nullVal
 import world.phantasmal.observable.value.trueVal
 import world.phantasmal.webui.dom.Icon
-import world.phantasmal.webui.selectFiles
+import world.phantasmal.webui.files.FileHandle
+import world.phantasmal.webui.files.FileType
+import world.phantasmal.webui.files.showFilePicker
 
 class FileButton(
     visible: Val<Boolean> = trueVal(),
@@ -18,9 +19,9 @@ class FileButton(
     textVal: Val<String>? = null,
     iconLeft: Icon? = null,
     iconRight: Icon? = null,
-    private val accept: String = "",
+    private val types: List<FileType> = emptyList(),
     private val multiple: Boolean = false,
-    private val filesSelected: ((List<File>) -> Unit)? = null,
+    private val filesSelected: ((List<FileHandle>?) -> Unit)? = null,
 ) : Button(visible, enabled, tooltip, className, text, textVal, iconLeft, iconRight) {
     override fun interceptElement(element: HTMLElement) {
         element.classList.add("pw-file-button")
@@ -28,7 +29,7 @@ class FileButton(
         if (filesSelected != null) {
             element.onclick = {
                 scope.launch {
-                    filesSelected.invoke(selectFiles(accept, multiple))
+                    filesSelected.invoke(showFilePicker(types, multiple))
                 }
             }
         }