diff --git a/package.json b/package.json
index 97a123c..b81301f 100644
--- a/package.json
+++ b/package.json
@@ -21,10 +21,9 @@
     "@chakra-ui/react": "^2.8.2",
     "@emotion/react": "^11.11.1",
     "@emotion/styled": "^11.11.0",
-    "@jixun/libparakeet": "0.4.2",
+    "@jixun/libparakeet": "0.4.3",
     "@reduxjs/toolkit": "^2.0.1",
     "framer-motion": "^10.16.16",
-    "immer": "^10.0.3",
     "nanoid": "^5.0.4",
     "radash": "^11.0.0",
     "react": "^18.2.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index e78a7b8..a38f9a3 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -33,17 +33,14 @@ dependencies:
     specifier: ^11.11.0
     version: 11.11.0(@emotion/react@11.11.1)(@types/react@18.2.45)(react@18.2.0)
   '@jixun/libparakeet':
-    specifier: 0.4.2
-    version: 0.4.2
+    specifier: 0.4.3
+    version: 0.4.3
   '@reduxjs/toolkit':
     specifier: ^2.0.1
     version: 2.0.1(react-redux@9.0.4)(react@18.2.0)
   framer-motion:
     specifier: ^10.16.16
     version: 10.16.16(react-dom@18.2.0)(react@18.2.0)
-  immer:
-    specifier: ^10.0.3
-    version: 10.0.3
   nanoid:
     specifier: ^5.0.4
     version: 5.0.4
@@ -2885,8 +2882,8 @@ packages:
       '@sinclair/typebox': 0.27.8
     dev: true
 
-  /@jixun/libparakeet@0.4.2:
-    resolution: {integrity: sha512-E6XXrHeOOIexKSyWUgQwHUpZNMh5I1IoC9gbwyVQjJhBLiURy6KU7U2Fgsg62Q3BSkdi7NwbdbPERrygUFmA7Q==}
+  /@jixun/libparakeet@0.4.3:
+    resolution: {integrity: sha512-Y+h65ZXbJ604sO1RyXA+2kx1WQoA6xJSlIIFWLcmAJpbj34XY6eCpyRXnltgkzcOLsLaO89jjGqMPS7MBC4XqA==}
     dev: false
 
   /@jridgewell/gen-mapping@0.3.3:
diff --git a/src/decrypt-worker/constants.ts b/src/decrypt-worker/constants.ts
index 4cde929..643d4ae 100644
--- a/src/decrypt-worker/constants.ts
+++ b/src/decrypt-worker/constants.ts
@@ -1,5 +1,6 @@
 export enum DECRYPTION_WORKER_ACTION_NAME {
   DECRYPT = 'DECRYPT',
+  FIND_QMC_MUSICEX_NAME = 'FIND_QMC_MUSICEX_NAME',
   VERSION = 'VERSION',
 }
 
diff --git a/src/decrypt-worker/crypto/qmc/qmc_v2.ts b/src/decrypt-worker/crypto/qmc/qmc_v2.ts
index 6996802..710b90d 100644
--- a/src/decrypt-worker/crypto/qmc/qmc_v2.ts
+++ b/src/decrypt-worker/crypto/qmc/qmc_v2.ts
@@ -1,10 +1,9 @@
 import { transformBlob } from '~/decrypt-worker/util/transformBlob';
 import type { CryptoBase } from '../CryptoBase';
 import type { DecryptCommandOptions } from '~/decrypt-worker/types.ts';
-import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from './qmc_v2.key.ts';
 import { fetchParakeet } from '@jixun/libparakeet';
 import { stringToUTF8Bytes } from '~/decrypt-worker/util/utf8Encoder.ts';
-import { makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto.ts';
+import { makeQMCv2FooterParser, makeQMCv2KeyCrypto } from '~/decrypt-worker/util/qmc2KeyCrypto.ts';
 
 export class QMC2Crypto implements CryptoBase {
   cryptoName = 'QMC/v2';
@@ -12,7 +11,7 @@ export class QMC2Crypto implements CryptoBase {
 
   async decrypt(buffer: ArrayBuffer): Promise<Blob> {
     const parakeet = await fetchParakeet();
-    const footerParser = parakeet.make.QMCv2FooterParser(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
+    const footerParser = makeQMCv2FooterParser(parakeet);
     return transformBlob(buffer, (p) => p.make.QMCv2(footerParser), {
       parakeet,
       cleanup: () => footerParser.delete(),
diff --git a/src/decrypt-worker/types.ts b/src/decrypt-worker/types.ts
index 114042e..9157ed0 100644
--- a/src/decrypt-worker/types.ts
+++ b/src/decrypt-worker/types.ts
@@ -10,3 +10,8 @@ export interface DecryptCommandPayload {
   blobURI: string;
   options: DecryptCommandOptions;
 }
+
+export interface FetchMusicExNamePayload {
+  id: string;
+  blobURI: string;
+}
diff --git a/src/decrypt-worker/util/qmc2KeyCrypto.ts b/src/decrypt-worker/util/qmc2KeyCrypto.ts
index 7f534ee..ae55466 100644
--- a/src/decrypt-worker/util/qmc2KeyCrypto.ts
+++ b/src/decrypt-worker/util/qmc2KeyCrypto.ts
@@ -2,3 +2,4 @@ import type { Parakeet } from '@jixun/libparakeet';
 import { SEED, ENC_V2_KEY_1, ENC_V2_KEY_2 } from '../crypto/qmc/qmc_v2.key';
 
 export const makeQMCv2KeyCrypto = (p: Parakeet) => p.make.QMCv2KeyCrypto(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
+export const makeQMCv2FooterParser = (p: Parakeet) => p.make.QMCv2FooterParser(SEED, ENC_V2_KEY_1, ENC_V2_KEY_2);
diff --git a/src/decrypt-worker/worker.ts b/src/decrypt-worker/worker.ts
index eee2239..134483c 100644
--- a/src/decrypt-worker/worker.ts
+++ b/src/decrypt-worker/worker.ts
@@ -4,9 +4,11 @@ import { DECRYPTION_WORKER_ACTION_NAME } from './constants';
 import { getSDKVersion } from '@jixun/libparakeet';
 
 import { workerDecryptHandler } from './worker/handler/decrypt';
+import { workerParseMusicExMediaName } from './worker/handler/qmcv2_parser';
 
 const bus = new WorkerServerBus();
 onmessage = bus.onmessage;
 
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.DECRYPT, workerDecryptHandler);
+bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.FIND_QMC_MUSICEX_NAME, workerParseMusicExMediaName);
 bus.addEventHandler(DECRYPTION_WORKER_ACTION_NAME.VERSION, getSDKVersion);
diff --git a/src/decrypt-worker/worker/handler/qmcv2_parser.ts b/src/decrypt-worker/worker/handler/qmcv2_parser.ts
new file mode 100644
index 0000000..44dab27
--- /dev/null
+++ b/src/decrypt-worker/worker/handler/qmcv2_parser.ts
@@ -0,0 +1,27 @@
+import { fetchParakeet, FooterParserState } from '@jixun/libparakeet';
+import type { FetchMusicExNamePayload } from '~/decrypt-worker/types';
+import { makeQMCv2FooterParser } from '~/decrypt-worker/util/qmc2KeyCrypto';
+import { timedLogger, withGroupedLogs as withTimeGroupedLogs } from '~/util/logUtils';
+
+export const workerParseMusicExMediaName = async ({ id, blobURI }: FetchMusicExNamePayload) => {
+  const label = `decrypt(${id})`;
+  return withTimeGroupedLogs(label, async () => {
+    const parakeet = await timedLogger(`${label}/init`, fetchParakeet);
+    const blob = await timedLogger(`${label}/fetch-src`, async () =>
+      fetch(blobURI, { headers: { Range: 'bytes=-1024' } }).then((r) => r.blob()),
+    );
+    const buffer = await timedLogger(`${label}/read-src`, async () => {
+      // Firefox: the range header does not work...?
+      const blobBuffer = await blob.arrayBuffer();
+      if (blobBuffer.byteLength > 1024) {
+        return blobBuffer.slice(-1024);
+      }
+      return blobBuffer;
+    });
+    const parsed = makeQMCv2FooterParser(parakeet).parse(buffer);
+    if (parsed.state === FooterParserState.OK) {
+      return parsed.mediaName;
+    }
+    return '# N/A';
+  });
+};
diff --git a/src/dummy.mjs b/src/dummy.mjs
index db2604f..bdd93cf 100644
--- a/src/dummy.mjs
+++ b/src/dummy.mjs
@@ -1,5 +1,5 @@
 // This is a dummy module for vite/rollup to resolve.
 export function createRequire() {
-  import('immer'); // we need to import something, so vite don't complain on build
+  import('radash'); // we need to import something, so vite don't complain on build
   throw new Error('this is a dummy module. Do not use');
 }
diff --git a/src/features/file-listing/fileListingSlice.ts b/src/features/file-listing/fileListingSlice.ts
index c60a1c5..81e5180 100644
--- a/src/features/file-listing/fileListingSlice.ts
+++ b/src/features/file-listing/fileListingSlice.ts
@@ -2,9 +2,9 @@ import { createSlice, createAsyncThunk } from '@reduxjs/toolkit';
 import type { PayloadAction } from '@reduxjs/toolkit';
 import type { RootState } from '~/store';
 
-import type { DecryptionResult } from '~/decrypt-worker/constants';
-import type { DecryptCommandOptions } from '~/decrypt-worker/types';
-import { decryptionQueue } from '~/decrypt-worker/client';
+import { DECRYPTION_WORKER_ACTION_NAME, type DecryptionResult } from '~/decrypt-worker/constants';
+import type { DecryptCommandOptions, FetchMusicExNamePayload } from '~/decrypt-worker/types';
+import { decryptionQueue, workerClientBus } from '~/decrypt-worker/client';
 import { DecryptErrorType } from '~/decrypt-worker/util/DecryptError';
 import { selectQMCv2KeyByFileName, selectKWMv2Key, selectQtfmAndroidKey } from '../settings/settingsSelector';
 
@@ -44,7 +44,7 @@ export interface FileListingState {
   displayMode: ListingMode;
 }
 const initialState: FileListingState = {
-  files: Object.create(null),
+  files: {},
   displayMode: ListingMode.LIST,
 };
 
@@ -64,17 +64,27 @@ export const processFile = createAsyncThunk<
     thunkAPI.dispatch(setFileAsProcessing({ id: fileId }));
   };
 
-  const fileHeader = await fetch(file.raw, {
-    headers: {
-      Range: 'bytes=0-1023',
-    },
-  })
+  const fileHeader = await fetch(file.raw, { headers: { Range: 'bytes=0-1023' } })
     .then((r) => r.blob())
-    .then((r) => r.arrayBuffer());
+    .then((r) => r.arrayBuffer())
+    .then((r) => {
+      if (r.byteLength > 1024) {
+        return r.slice(0, 1024);
+      }
+      return r;
+    });
+
+  const qmcv2MusicExMediaFile = await workerClientBus.request<string, FetchMusicExNamePayload>(
+    DECRYPTION_WORKER_ACTION_NAME.FIND_QMC_MUSICEX_NAME,
+    {
+      id: fileId,
+      blobURI: file.raw,
+    },
+  );
 
   const options: DecryptCommandOptions = {
     fileName: file.fileName,
-    qmc2Key: selectQMCv2KeyByFileName(state, file.fileName),
+    qmc2Key: selectQMCv2KeyByFileName(state, qmcv2MusicExMediaFile || file.fileName),
     kwm2key: selectKWMv2Key(state, new DataView(fileHeader)),
     qingTingAndroidKey: selectQtfmAndroidKey(state),
   };
diff --git a/src/features/settings/panels/PanelQMCv2Key.tsx b/src/features/settings/panels/PanelQMCv2Key.tsx
index 6b37517..8added4 100644
--- a/src/features/settings/panels/PanelQMCv2Key.tsx
+++ b/src/features/settings/panels/PanelQMCv2Key.tsx
@@ -61,7 +61,7 @@ export function PanelQMCv2Key() {
           alert(`不是支持的 SQLite 数据库文件。`);
           return;
         }
-      } else if (/MMKVStreamEncryptId|filenameEkeyMap/i.test(file.name)) {
+      } else if (/MMKVStreamEncryptId|filenameEkeyMap|qmpc-mmkv-v1/i.test(file.name)) {
         const fileBuffer = await file.arrayBuffer();
         const map = parseAndroidQmEKey(new DataView(fileBuffer));
         qmc2Keys = Array.from(map.entries(), ([name, ekey]) => ({ name: getFileName(name), ekey }));
diff --git a/src/features/settings/persistSettings.ts b/src/features/settings/persistSettings.ts
index 4aba7a9..17b548b 100644
--- a/src/features/settings/persistSettings.ts
+++ b/src/features/settings/persistSettings.ts
@@ -1,43 +1,44 @@
 import { debounce } from 'radash';
-import { produce } from 'immer';
 
 import type { AppStore } from '~/store';
 import { settingsSlice, setProductionChanges, ProductionSettings } from './settingsSlice';
 import { enumObject } from '~/util/objects';
 import { getLogger } from '~/util/logUtils';
 import { parseKwm2ProductionKey } from './keyFormats';
+import { deepClone } from '~/util/deepClone';
 
 const DEFAULT_STORAGE_KEY = 'um-react-settings';
 
 function mergeSettings(settings: ProductionSettings): ProductionSettings {
-  return produce(settingsSlice.getInitialState().production, (draft) => {
-    if (settings?.qmc2) {
-      const { allowFuzzyNameSearch, keys } = settings.qmc2;
-      for (const [k, v] of enumObject(keys)) {
-        if (typeof v === 'string') {
-          draft.qmc2.keys[k] = v;
-        }
-      }
-
-      if (typeof allowFuzzyNameSearch === 'boolean') {
-        draft.qmc2.allowFuzzyNameSearch = allowFuzzyNameSearch;
+  const draft = deepClone(settingsSlice.getInitialState().production);
+  if (settings?.qmc2) {
+    const { allowFuzzyNameSearch, keys } = settings.qmc2;
+    for (const [k, v] of enumObject(keys)) {
+      if (typeof v === 'string') {
+        draft.qmc2.keys[k] = v;
       }
     }
 
-    if (settings?.kwm2) {
-      const { keys } = settings.kwm2;
+    if (typeof allowFuzzyNameSearch === 'boolean') {
+      draft.qmc2.allowFuzzyNameSearch = allowFuzzyNameSearch;
+    }
+  }
 
-      for (const [k, v] of enumObject(keys)) {
-        if (typeof v === 'string' && parseKwm2ProductionKey(k)) {
-          draft.kwm2.keys[k] = v;
-        }
+  if (settings?.kwm2) {
+    const { keys } = settings.kwm2;
+
+    for (const [k, v] of enumObject(keys)) {
+      if (typeof v === 'string' && parseKwm2ProductionKey(k)) {
+        draft.kwm2.keys[k] = v;
       }
     }
+  }
 
-    if (typeof settings?.qtfm?.android === 'string') {
-      draft.qtfm.android = settings.qtfm.android.replace(/[^0-9a-fA-F]/g, '');
-    }
-  });
+  if (typeof settings?.qtfm?.android === 'string') {
+    draft.qtfm.android = settings.qtfm.android.replace(/[^0-9a-fA-F]/g, '');
+  }
+
+  return draft;
 }
 
 export function persistSettings(store: AppStore, storageKey = DEFAULT_STORAGE_KEY) {
diff --git a/src/util/deepClone.ts b/src/util/deepClone.ts
new file mode 100644
index 0000000..e8971ac
--- /dev/null
+++ b/src/util/deepClone.ts
@@ -0,0 +1,3 @@
+export function deepClone<T>(obj: T): T {
+  return JSON.parse(JSON.stringify(obj));
+}
diff --git a/vite.config.ts b/vite.config.ts
index 939cd47..d5189fd 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -98,7 +98,7 @@ export default defineConfig({
           reacts: ['react', 'react-dom', 'react-dropzone', 'react-promise-suspense', 'react-redux', '@reduxjs/toolkit'],
           chakra: ['@chakra-ui/react', '@emotion/react', '@emotion/styled', 'framer-motion'],
           icons: ['react-icons', '@chakra-ui/icons'],
-          utility: ['radash', 'nanoid', 'immer', 'react-syntax-highlighter'],
+          utility: ['radash', 'nanoid', 'react-syntax-highlighter'],
         },
       },
     },