diff --git a/gsuid_core/handler.py b/gsuid_core/handler.py
index 413dfe7..aaaf833 100644
--- a/gsuid_core/handler.py
+++ b/gsuid_core/handler.py
@@ -47,6 +47,10 @@ async def msg_process(msg: MessageReceive) -> Event:
             event.image_list.append(_msg.data)
         elif _msg.type == 'reply':
             event.reply = _msg.data
+        elif _msg.type == 'file' and _msg.data:
+            data = _msg.data.split('|')
+            event.file_name = data[0]
+            event.file = data[1]
         _content.append(_msg)
     event.content = _content
     return event
diff --git a/gsuid_core/models.py b/gsuid_core/models.py
index bfd8792..1e6dfe1 100644
--- a/gsuid_core/models.py
+++ b/gsuid_core/models.py
@@ -29,6 +29,8 @@ class Event(MessageReceive):
     at_list: List[Any] = []
     is_tome: bool = False
     reply: Optional[str] = None
+    file_name: Optional[str] = None
+    file: Optional[str] = None
 
 
 class MessageSend(Struct):
diff --git a/gsuid_core/sv.py b/gsuid_core/sv.py
index 2bcd8f4..05294d3 100644
--- a/gsuid_core/sv.py
+++ b/gsuid_core/sv.py
@@ -101,7 +101,9 @@ class SV:
 
     def _on(
         self,
-        type: Literal['prefix', 'suffix', 'keyword', 'fullmatch', 'command'],
+        type: Literal[
+            'prefix', 'suffix', 'keyword', 'fullmatch', 'command', 'file'
+        ],
         keyword: Union[str, Tuple[str, ...]],
         block: bool = False,
         to_me: bool = False,
@@ -162,3 +164,11 @@ class SV:
         to_me: bool = False,
     ) -> Callable:
         return self._on('command', keyword, block, to_me)
+
+    def on_file(
+        self,
+        file_type: str,
+        block: bool = False,
+        to_me: bool = False,
+    ) -> Callable:
+        return self._on('file', file_type, block, to_me)
diff --git a/gsuid_core/trigger.py b/gsuid_core/trigger.py
index 72ca9d5..71eb6bb 100644
--- a/gsuid_core/trigger.py
+++ b/gsuid_core/trigger.py
@@ -6,7 +6,9 @@ from gsuid_core.models import Event
 class Trigger:
     def __init__(
         self,
-        type: Literal['prefix', 'suffix', 'keyword', 'fullmatch', 'command'],
+        type: Literal[
+            'prefix', 'suffix', 'keyword', 'fullmatch', 'command', 'file'
+        ],
         keyword: str,
         func: Callable,
         block: bool = False,
@@ -18,13 +20,15 @@ class Trigger:
         self.block = block
         self.to_me = to_me
 
-    def check_command(self, raw_msg: Event) -> bool:
-        msg = raw_msg.raw_text
+    def check_command(self, ev: Event) -> bool:
+        msg = ev.raw_text
         if self.to_me:
-            if raw_msg.is_tome:
+            if ev.is_tome:
                 pass
             else:
                 return False
+        if self.type == 'file':
+            return self._check_file(self.keyword, ev)
         return getattr(self, f'_check_{self.type}')(self.keyword, msg)
 
     def _check_prefix(self, prefix: str, msg: str) -> bool:
@@ -52,6 +56,12 @@ class Trigger:
             return True
         return False
 
+    def _check_file(self, file_type: str, ev: Event) -> bool:
+        if ev.file:
+            if ev.file_name and ev.file_name.split('.')[-1] == file_type:
+                return True
+        return False
+
     async def get_command(self, msg: Event) -> Event:
         msg.command = self.keyword
         msg.text = msg.raw_text.replace(self.keyword, '')