diff --git a/pywxdump/file/AttachmentAbstract.py b/pywxdump/file/AttachmentAbstract.py
new file mode 100644
index 0000000..811202a
--- /dev/null
+++ b/pywxdump/file/AttachmentAbstract.py
@@ -0,0 +1,26 @@
+from typing import Protocol, IO
+
+
+# 基类
+class Attachment(Protocol):
+
+    def exists(self, path) -> bool:
+        pass
+
+    def makedirs(self, path) -> bool:
+        pass
+
+    def open(self, path, param) -> IO:
+        pass
+
+    @classmethod
+    def join(cls, __a: str, *paths: str) -> str:
+        pass
+
+    @classmethod
+    def dirname(cls, path: str) -> str:
+        pass
+
+    @classmethod
+    def basename(cls, path: str) -> str:
+        pass
diff --git a/pywxdump/file/AttachmentContext.py b/pywxdump/file/AttachmentContext.py
new file mode 100644
index 0000000..3556c2a
--- /dev/null
+++ b/pywxdump/file/AttachmentContext.py
@@ -0,0 +1,72 @@
+import os
+from datetime import datetime
+from typing import AnyStr, BinaryIO, Callable, Union, IO
+from flask import send_file, Response
+
+from pywxdump.file.AttachmentAbstract import Attachment
+from pywxdump.file.LocalAttachment import LocalAttachment
+from pywxdump.file.S3Attachment import S3Attachment
+
+
+def determine_strategy(file_path: str) -> Attachment:
+    if file_path.startswith("s3://"):
+        return S3Attachment()
+    else:
+        return LocalAttachment()
+
+
+def exists(path: str) -> bool:
+    return determine_strategy(path).exists(path)
+
+
+def open_file(path: str, mode: str) -> IO:
+    return determine_strategy(path).open(path, mode)
+
+
+def makedirs(path: str) -> bool:
+    return determine_strategy(path).makedirs(path)
+
+
+def join(__a: str, *paths: str) -> str:
+    return determine_strategy(__a).join(__a, *paths)
+
+
+def dirname(path: str) -> str:
+    return determine_strategy(path).dirname(path)
+
+
+def basename(path: str) -> str:
+    return determine_strategy(path).basename(path)
+
+
+def send_attachment(
+        path_or_file: Union[os.PathLike[AnyStr], str],
+        mimetype: Union[str, None] = None,
+        as_attachment: bool = False,
+        download_name: Union[str, None] = None,
+        conditional: bool = True,
+        etag: Union[bool, str] = True,
+        last_modified: Union[datetime, int, float, None] = None,
+        max_age: Union[None, int, Callable[[Union[str, None]], Union[int, None]]] = None,
+) -> Response:
+    file_io = open_file(path_or_file, "rb")
+
+    # 如果没有提供 download_name 或 mimetype，则从 path_or_file 中获取文件名和 MIME 类型
+    if download_name is None:
+        download_name = basename(path_or_file)
+    if mimetype is None:
+        mimetype = 'application/octet-stream'
+
+    return send_file(file_io, mimetype, as_attachment, download_name, conditional, etag, last_modified, max_age)
+
+
+def download_file(db_path, local_path):
+    with open(local_path, 'wb') as f:
+        with open_file(db_path, 'rb') as r:
+            f.write(r.read())
+    return local_path
+
+
+def isLocalPath(path: str) -> bool:
+    return isinstance(determine_strategy(path), LocalAttachment)
+
diff --git a/pywxdump/file/LocalAttachment.py b/pywxdump/file/LocalAttachment.py
new file mode 100644
index 0000000..3705b45
--- /dev/null
+++ b/pywxdump/file/LocalAttachment.py
@@ -0,0 +1,46 @@
+# 本地文件处理类
+import os
+import sys
+from typing import IO
+
+
+class LocalAttachment:
+
+    def open(self, path, mode) -> IO:
+        path = self.dealLocalPath(path)
+        return open(path, mode)
+
+    def exists(self, path) -> bool:
+        path = self.dealLocalPath(path)
+        return os.path.exists(path)
+
+    def makedirs(self, path) -> bool:
+        path = self.dealLocalPath(path)
+        os.makedirs(path)
+        return True
+
+    @classmethod
+    def join(cls, __a: str, *paths: str) -> str:
+        return os.path.join(__a, *paths)
+
+    @classmethod
+    def dirname(cls, path: str) -> str:
+        return os.path.dirname(path)
+
+    @classmethod
+    def basename(cls, path: str) -> str:
+        return os.path.basename(path)
+
+    def dealLocalPath(self, path: str) -> str:
+        # 获取当前系统的地址分隔符
+        # 将path中的 /替换为当前系统的分隔符
+        path = path.replace('/', os.sep)
+        if sys.platform == "win32":
+            # 如果是windows系统，且路径长度超过260个字符
+            if len(path) >= 260:
+                # 添加前缀
+                return '\\\\?\\' + path
+            else:
+                return path
+        else:
+            return path
diff --git a/pywxdump/file/S3Attachment.py b/pywxdump/file/S3Attachment.py
new file mode 100644
index 0000000..d117981
--- /dev/null
+++ b/pywxdump/file/S3Attachment.py
@@ -0,0 +1,96 @@
+# 对象存储文件处理类（示例：假设是 AWS S3）
+import os
+from typing import IO
+from urllib.parse import urlparse
+
+from botocore.exceptions import ClientError
+from smart_open import open
+import boto3
+from botocore.client import Config
+
+class S3Attachment:
+
+    def __init__(self):
+        # 腾讯云 COS 配置
+        self.cos_endpoint = "https://cos.<your-region>.myqcloud.com"  # 替换 <your-region> 为你的 COS 区域，例如 ap-shanghai
+        self.access_key_id = "SecretId"  # 替换为你的腾讯云 SecretId
+        self.secret_access_key = "SecretKey"  # 替换为你的腾讯云 SecretKey
+
+        # 创建 S3 客户端
+        self.s3_client = boto3.client(
+            's3',
+            endpoint_url=self.cos_endpoint,
+            aws_access_key_id=self.access_key_id,
+            aws_secret_access_key=self.secret_access_key,
+            config=Config(s3={"addressing_style": "virtual", "signature_version": 's3v4'})
+        )
+
+    def exists(self, path) -> bool:
+        bucket_name, path = self.dealS3Url(path)
+        # 检查是否为目录
+        if path.endswith('/'):
+            # 尝试列出该路径下的对象
+            try:
+                response = self.s3_client.list_objects_v2(Bucket=bucket_name, Prefix=path, MaxKeys=1)
+                if 'Contents' in response:
+                    return True
+                else:
+                    return False
+            except ClientError as e:
+                print(f"Error: {e}")
+                return False
+        else:
+            # 检查是否为文件
+            try:
+                self.s3_client.head_object(Bucket=bucket_name, Key=path)
+                return True
+            except ClientError as e:
+                if e.response['Error']['Code'] == '404':
+                    return False
+                else:
+                    print(f"Error: {e}")
+                    return False
+
+    def makedirs(self, path) -> bool:
+        if not self.exists(path):
+            bucket_name, path = self.dealS3Url(path)
+            self.s3_client.put_object(Bucket=bucket_name, Key=f'{path}/')
+        return True
+
+    def open(self, path, mode) -> IO:
+        self.dealS3Url(path)
+        return open(uri=path, mode=mode, transport_params={'client': self.s3_client})
+
+    @classmethod
+    def join(cls, __a: str, *paths: str) -> str:
+        return os.path.join(__a, *paths)
+
+    @classmethod
+    def dirname(cls, path: str) -> str:
+        return os.path.dirname(path)
+
+    @classmethod
+    def basename(cls, path: str) -> str:
+        return os.path.basename(path)
+
+    def dealS3Url(self, path: str) -> object:
+        """
+        解析 S3 URL 并返回存储桶名称和路径
+
+        参数:
+        path (str): S3 URL
+
+        返回:
+        tuple: 包含存储桶名称和路径的元组
+        """
+        parsed_url = urlparse(path)
+
+        # 确保URL是S3 URL
+        if parsed_url.scheme != 's3':
+            raise ValueError("URL必须是S3 URL，格式为s3://bucket_name/path")
+
+        bucket_name = parsed_url.netloc
+        s3_path = parsed_url.path.lstrip('/')
+
+        return bucket_name, s3_path
+