diff --git a/chat_export_helpers.py b/chat_export_helpers.py
index 5c2794c..dfbca46 100644
--- a/chat_export_helpers.py
+++ b/chat_export_helpers.py
@@ -167,6 +167,17 @@ def _extract_content(local_id, local_type, content, ct, chat_username, chat_disp
     if content is None:
         return None, None
 
+    # 群消息的 content 形如 'wxid_xxx:\n<xml...>'。Issue #88: 之前直接把
+    # 带前缀的字符串喂给 XML 解析器，群里的引用回复 / 卡片 / 视频等都因
+    # 解析失败导致 type 渲染成 link_or_file 且 content 为空。
+    is_group = bool(chat_username) and chat_username.endswith('@chatroom')
+    if is_group:
+        _, content = mcp_server._parse_message_content(content, local_type, True)
+
+    # names 用于群引用回复的发送者名解析（_resolve_quote_sender_label）。
+    # 1-on-1 场景也能用到（按 wxid 查显示名）。
+    names = mcp_server.get_contact_names()
+
     base, _ = mcp_server._split_msg_type(local_type)
     if base == 1:
         return (content or ""), None
@@ -176,7 +187,7 @@ def _extract_content(local_id, local_type, content, ct, chat_username, chat_disp
         return _format_sticker_message(content), None
     if base == 49:
         rendered = mcp_server._format_app_message_text(
-            content, local_type, False, chat_username, chat_display_name, {}
+            content, local_type, is_group, chat_username, chat_display_name, names
         )
         transfer = _extract_transfer_extras(content)
         extras = {'type': 'transfer', 'transfer': transfer} if transfer else None
diff --git a/tests/test_chat_export_helpers.py b/tests/test_chat_export_helpers.py
new file mode 100644
index 0000000..e532879
--- /dev/null
+++ b/tests/test_chat_export_helpers.py
@@ -0,0 +1,104 @@
+"""Tests for `chat_export_helpers._extract_content` group prefix handling.
+
+Issue #88: 群聊里的引用回复 / appmsg 卡片在 export_chat / export_all_chats
+渲染成 link_or_file 且 content 为空。根因是 `_extract_content` 把带
+`wxid_xxx:\\n` 群前缀的原始 content 直接喂给 `_format_app_message_text`，
+XML 解析器在前缀文本上崩溃。
+
+修复后：
+- 检测到 chat_username 是 @chatroom，先用 `_parse_message_content` 剥前缀
+- 把 `is_group=True` 透传给 `_format_app_message_text` 让引用回复的发送者
+  标签解析走群路径
+- 用真实的 contact names dict 而不是 `{}` 让 1-on-1 也能解出昵称
+"""
+import unittest
+from unittest.mock import patch
+
+import chat_export_helpers
+import mcp_server
+
+
+def _refer_appmsg(refer_content="hello world"):
+    """合成一条引用回复 appmsg。"""
+    return (
+        '<msg><appmsg appid="" sdkver="0">'
+        '<title>quote reply</title>'
+        '<type>57</type>'
+        '<refermsg>'
+        '<type>1</type>'
+        f'<content>{refer_content}</content>'
+        '<fromusr>wxid_orig_sender</fromusr>'
+        '<displayname>Original Sender</displayname>'
+        '</refermsg>'
+        '</appmsg></msg>'
+    )
+
+
+class ExtractContentGroupPrefixTests(unittest.TestCase):
+    def setUp(self):
+        # Skip decompression
+        self._patch = patch.object(
+            mcp_server, '_decompress_content',
+            side_effect=lambda content, ct: content,
+        )
+        self._patch.start()
+        self._names_patch = patch.object(
+            mcp_server, 'get_contact_names',
+            return_value={'wxid_orig_sender': 'Alice'},
+        )
+        self._names_patch.start()
+
+    def tearDown(self):
+        self._patch.stop()
+        self._names_patch.stop()
+
+    def test_group_appmsg_with_prefix_renders_correctly(self):
+        """Issue #88: 群引用回复带 'wxid_xxx:\\n' 前缀，需要正确剥离后再解析。"""
+        prefixed = 'wxid_group_member:\n' + _refer_appmsg('hello group')
+        rendered, extras = chat_export_helpers._extract_content(
+            local_id=100, local_type=49, content=prefixed, ct=0,
+            chat_username='12345@chatroom', chat_display_name='Test Group',
+        )
+        self.assertIsNotNone(rendered, "群引用回复不应该解析失败返回 None")
+        self.assertIn('quote reply', rendered)
+        self.assertIn('hello group', rendered, "被引用内容应该出现在渲染结果里")
+
+    def test_one_on_one_appmsg_unaffected(self):
+        """1-on-1 场景没有前缀，行为应该保持不变。"""
+        rendered, _ = chat_export_helpers._extract_content(
+            local_id=100, local_type=49, content=_refer_appmsg('hi'), ct=0,
+            chat_username='wxid_friend', chat_display_name='Friend',
+        )
+        self.assertIsNotNone(rendered)
+        self.assertIn('hi', rendered)
+
+    def test_group_text_prefix_stripped(self):
+        """群里的 base=1 text 消息，content 也带前缀，应该被剥掉。"""
+        text, _ = chat_export_helpers._extract_content(
+            local_id=100, local_type=1, content='wxid_xx:\nhello group',
+            ct=0, chat_username='12345@chatroom', chat_display_name='Group',
+        )
+        self.assertEqual(text, 'hello group')
+
+    def test_one_on_one_text_unaffected(self):
+        """1-on-1 text 没有前缀概念，原样返回。"""
+        text, _ = chat_export_helpers._extract_content(
+            local_id=100, local_type=1, content='hello friend', ct=0,
+            chat_username='wxid_friend', chat_display_name='Friend',
+        )
+        self.assertEqual(text, 'hello friend')
+
+    def test_group_quote_uses_real_names(self):
+        """群引用回复的发送者标签应该用真实 contact names 解析。"""
+        prefixed = 'wxid_group_member:\n' + _refer_appmsg()
+        rendered, _ = chat_export_helpers._extract_content(
+            local_id=100, local_type=49, content=prefixed, ct=0,
+            chat_username='12345@chatroom', chat_display_name='Test Group',
+        )
+        # is_group=True 走 group 分支：用 ref_user (wxid_orig_sender) 查 names
+        # → 'Alice'。原先 names={} 会回退到 displayname。
+        self.assertIn('Alice', rendered, "应该用 names dict 解析出 'Alice'")
+
+
+if __name__ == "__main__":
+    unittest.main()