diff --git a/plugins/explorer/client/file-picker.vue b/plugins/explorer/client/file-picker.vue
index b1dfa891..831bbfd8 100644
--- a/plugins/explorer/client/file-picker.vue
+++ b/plugins/explorer/client/file-picker.vue
@@ -73,10 +73,12 @@ const allowDir = computed(() => options.value.filters.includes('directory'))
 const allowFile = computed(() => options.value.filters.some(x => x !== 'directory'))
 
 const hint = computed(() => {
-  if (allowDir.value) {
-    return options.value.filters.length === 1 ? '选择目录' : '选择目录或文件'
-  } else {
+  if (!allowDir.value) {
     return '选择文件'
+  } else if (allowFile.value) {
+    return '选择目录或文件'
+  } else {
+    return '选择目录'
   }
 })
 
@@ -89,11 +91,16 @@ const entries = computed(() => {
   return children.filter((entry) => {
     if (entry.type === 'directory') return true
     if (entry.type === 'file' || entry.type === 'symlink') {
-      if (filters.includes('file')) return true
+      const index = entry.name.lastIndexOf('.')
+      const ext = index === -1 ? '' : entry.name.slice(index)
       return filters.some((filter) => {
-        const index = entry.name.lastIndexOf('.')
-        const ext = index === -1 ? '' : entry.name.slice(index)
-        return filter === ext
+        if (filter === 'directory') return false
+        if (filter === 'file') return true
+        if (typeof filter === 'string') {
+          return filter === ext
+        } else {
+          return filter.extensions.includes(ext)
+        }
       })
     }
   })
diff --git a/plugins/explorer/client/index.vue b/plugins/explorer/client/index.vue
index 4730acf0..7ef831a2 100644
--- a/plugins/explorer/client/index.vue
+++ b/plugins/explorer/client/index.vue
@@ -82,7 +82,7 @@
 import { ref, computed, watch, onActivated, nextTick } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { useElementSize } from '@vueuse/core'
-import { base64ToArrayBuffer, send, store, useColorMode, useContext, useMenu } from '@koishijs/client'
+import { Binary, send, store, useColorMode, useContext, useMenu } from '@koishijs/client'
 import { Entry } from '@koishijs/plugin-explorer'
 import { files, TreeEntry, uploading, vFocus } from './store'
 import { model } from './editor'
@@ -323,7 +323,7 @@ watch(() => files[active.value], async (entry) => {
     if (mime) {
       entry.oldValue = entry.newValue = `data:${mime};base64,${base64}`
     } else {
-      entry.oldValue = entry.newValue = new TextDecoder().decode(base64ToArrayBuffer(base64))
+      entry.oldValue = entry.newValue = new TextDecoder().decode(Binary.fromBase64(base64))
     }
   }
   model.setValue(entry.newValue)
@@ -374,7 +374,7 @@ onActivated(async () => {
 
 async function downloadFile(filename: string) {
   const { base64 } = await send('explorer/read', filename)
-  const blob = new Blob([base64ToArrayBuffer(base64)])
+  const blob = new Blob([Binary.fromBase64(base64)])
   const url = URL.createObjectURL(blob)
   const a = document.createElement("a")
   a.href = url
diff --git a/plugins/explorer/client/upload.vue b/plugins/explorer/client/upload.vue
index 1d4ca96f..d165831c 100644
--- a/plugins/explorer/client/upload.vue
+++ b/plugins/explorer/client/upload.vue
@@ -13,7 +13,7 @@
 
 import { computed } from 'vue'
 import { useEventListener } from '@vueuse/core'
-import { arrayBufferToBase64, send } from '@koishijs/client'
+import { Binary, send } from '@koishijs/client'
 import { uploading } from './store'
 
 const showUploading = computed({
@@ -29,7 +29,7 @@ function handleDataTransfer(event: Event, transfer: DataTransfer) {
     const file = item.getAsFile()
     const reader = new FileReader()
     reader.addEventListener('load', function () {
-      send('explorer/write', prefix + file.name, arrayBufferToBase64(reader.result as ArrayBuffer), true)
+      send('explorer/write', prefix + file.name, Binary.toBase64(reader.result as ArrayBuffer), true)
     }, false)
     reader.readAsArrayBuffer(file)
   }
diff --git a/plugins/explorer/package.json b/plugins/explorer/package.json
index 234ca8e5..255fbea2 100644
--- a/plugins/explorer/package.json
+++ b/plugins/explorer/package.json
@@ -71,7 +71,8 @@
     "@koishijs/console": "^5.28.0",
     "anymatch": "^3.1.3",
     "chardet": "^2.0.0",
-    "chokidar": "^3.5.3",
+    "chokidar": "^3.6.0",
+    "file-type": "^16.5.4",
     "throttle-debounce": "^3.0.1"
   }
 }