diff --git a/locales/ja-JP.yml b/locales/ja-JP.yml
index 43ab7f2d69..c17e6959b9 100644
--- a/locales/ja-JP.yml
+++ b/locales/ja-JP.yml
@@ -845,6 +845,7 @@ failedToFetchAccountInformation: "アカウント情報の取得に失敗しま
 rateLimitExceeded: "レート制限を超えました"
 cropImage: "画像のクロップ"
 cropImageAsk: "画像をクロップしますか？"
+file: "ファイル"
 
 _emailUnavailable:
   used: "既に使用されています"
diff --git a/packages/client/src/pages/admin/file-dialog.vue b/packages/client/src/pages/admin-file.vue
similarity index 68%
rename from packages/client/src/pages/admin/file-dialog.vue
rename to packages/client/src/pages/admin-file.vue
index 0765548aab..b0e879b8f3 100644
--- a/packages/client/src/pages/admin/file-dialog.vue
+++ b/packages/client/src/pages/admin-file.vue
@@ -1,12 +1,7 @@
 <template>
-<XModalWindow ref="dialog"
-	:width="370"
-	@close="$refs.dialog.close()"
-	@closed="$emit('closed')"
->
-	<template v-if="file" #header>{{ file.name }}</template>
-	<div v-if="file" class="cxqhhsmd">
-		<div class="_section">
+<MkSpacer :content-max="500" :margin-min="16" :margin-max="32">
+	<div v-if="file" class="cxqhhsmd _formRoot">
+		<div class="_formBlock">
 			<MkDriveFileThumbnail class="thumbnail" :file="file" fit="contain"/>
 			<div class="info">
 				<span style="margin-right: 1em;">{{ file.type }}</span>
@@ -14,35 +9,33 @@
 				<MkTime :time="file.createdAt" mode="detail" style="display: block;"/>
 			</div>
 		</div>
-		<div class="_section">
-			<div class="_content">
-				<MkSwitch v-model="isSensitive" @update:modelValue="toggleIsSensitive">NSFW</MkSwitch>
-			</div>
+		<div class="_formBlock">
+			<MkSwitch v-model="isSensitive" @update:modelValue="toggleIsSensitive">NSFW</MkSwitch>
 		</div>
-		<div class="_section">
-			<div class="_content">
-				<MkButton full @click="showUser"><i class="fas fa-external-link-square-alt"></i> {{ $ts.user }}</MkButton>
-				<MkButton full danger @click="del"><i class="fas fa-trash-alt"></i> {{ $ts.delete }}</MkButton>
-			</div>
+		<div class="_formBlock">
+			<MkButton full @click="showUser"><i class="fas fa-external-link-square-alt"></i> {{ $ts.user }}</MkButton>
 		</div>
-		<div v-if="info" class="_section">
+		<div class="_formBlock">
+			<MkButton full danger @click="del"><i class="fas fa-trash-alt"></i> {{ $ts.delete }}</MkButton>
+		</div>
+		<div v-if="info" class="_formBlock">
 			<details class="_content rawdata">
 				<pre><code>{{ JSON.stringify(info, null, 2) }}</code></pre>
 			</details>
 		</div>
 	</div>
-</XModalWindow>
+</MkSpacer>
 </template>
 
 <script lang="ts" setup>
-import { } from 'vue';
+import { computed } from 'vue';
 import MkButton from '@/components/ui/button.vue';
 import MkSwitch from '@/components/form/switch.vue';
-import XModalWindow from '@/components/ui/modal-window.vue';
 import MkDriveFileThumbnail from '@/components/drive-file-thumbnail.vue';
 import bytes from '@/filters/bytes';
 import * as os from '@/os';
 import { i18n } from '@/i18n';
+import * as symbols from '@/symbols';
 
 let file: any = $ref(null);
 let info: any = $ref(null);
@@ -72,7 +65,7 @@ async function del() {
 	if (canceled) return;
 
 	os.apiWithDialog('drive/files/delete', {
-		fileId: file.id
+		fileId: file.id,
 	});
 }
 
@@ -80,6 +73,14 @@ async function toggleIsSensitive(v) {
 	await os.api('drive/files/update', { fileId: props.fileId, isSensitive: v });
 	isSensitive = v;
 }
+
+defineExpose({
+	[symbols.PAGE_INFO]: computed(() => ({
+		title: file ? i18n.ts.file + ': ' + file.name : i18n.ts.file,
+		icon: 'fas fa-file',
+		bg: 'var(--bg)',
+	})),
+});
 </script>
 
 <style lang="scss" scoped>
diff --git a/packages/client/src/pages/admin/files.vue b/packages/client/src/pages/admin/files.vue
index 6f43c2b7bd..9350911b60 100644
--- a/packages/client/src/pages/admin/files.vue
+++ b/packages/client/src/pages/admin/files.vue
@@ -82,9 +82,7 @@ function clear() {
 }
 
 function show(file) {
-	os.popup(defineAsyncComponent(() => import('./file-dialog.vue')), {
-		fileId: file.id,
-	}, {}, 'closed');
+	os.pageWindow(`/admin-file/${file.id}`);
 }
 
 async function find() {
diff --git a/packages/client/src/router.ts b/packages/client/src/router.ts
index 96c793166c..7e16c35d2b 100644
--- a/packages/client/src/router.ts
+++ b/packages/client/src/router.ts
@@ -1,9 +1,9 @@
 import { AsyncComponentLoader, defineAsyncComponent, markRaw } from 'vue';
 import { createRouter, createWebHistory } from 'vue-router';
+import { $i, iAmModerator } from './account';
 import MkLoading from '@/pages/_loading_.vue';
 import MkError from '@/pages/_error_.vue';
 import MkTimeline from '@/pages/timeline.vue';
-import { $i, iAmModerator } from './account';
 import { ui } from '@/config';
 
 // pathに/が入るとrollupが解決してくれないので、() => import('*.vue')を指定すること
@@ -70,6 +70,7 @@ const defaultRoutes = [
 	{ path: '/scratchpad', component: page('scratchpad') },
 	{ path: '/admin/:page(.*)?', component: iAmModerator ? page(() => import('./pages/admin/index.vue')) : page('not-found'), props: route => ({ initialPage: route.params.page || null }) },
 	{ path: '/admin', component: iAmModerator ? page(() => import('./pages/admin/index.vue')) : page('not-found') },
+	{ path: '/admin-file/:fileId', component: page('admin-file'), props: route => ({ fileId: route.params.fileId }) },
 	{ path: '/notes/:note', name: 'note', component: page('note'), props: route => ({ noteId: route.params.note }) },
 	{ path: '/tags/:tag', component: page('tag'), props: route => ({ tag: route.params.tag }) },
 	{ path: '/user-info/:user', component: page('user-info'), props: route => ({ userId: route.params.user }) },
@@ -82,7 +83,7 @@ const defaultRoutes = [
 	{ path: '/miauth/:session', component: page('miauth') },
 	{ path: '/authorize-follow', component: page('follow') },
 	{ path: '/share', component: page('share') },
-	{ path: '/:catchAll(.*)', component: page('not-found') }
+	{ path: '/:catchAll(.*)', component: page('not-found') },
 ];
 
 const chatRoutes = [
@@ -126,7 +127,7 @@ export const router = createRouter({
 				window.scroll({ top: 0, behavior: 'instant' });
 			}
 		};
-	}
+	},
 });
 
 router.afterEach((to, from) => {
@@ -141,6 +142,6 @@ export function resolve(path: string) {
 	return {
 		component: markRaw(route.components.default),
 		// TODO: route.propsには関数以外も入る可能性があるのでよしなにハンドリングする
-		props: route.props?.default ? route.props.default(resolved) : resolved.params
+		props: route.props.default ? route.props.default(resolved) : resolved.params,
 	};
 }