diff --git a/astrbot/core/message/components.py b/astrbot/core/message/components.py
index a9bb091224..15265c38d1 100644
--- a/astrbot/core/message/components.py
+++ b/astrbot/core/message/components.py
@@ -720,13 +720,38 @@ async def get_file(self, allow_return_url: bool = False) -> str:
         if allow_return_url and self.url:
             return self.url
 
-        if self.file_ and os.path.exists(self.file_):
-            return os.path.abspath(self.file_)
+        if self.file_:
+            path = self.file_
+            if path.startswith("file://"):
+                # 处理 file:// (2 slashes) 或 file:/// (3 slashes)
+                # pathlib.as_uri() 通常生成 file:///
+                path = path[7:]
+                # 兼容 Windows: file:///C:/path -> /C:/path -> C:/path
+                if (
+                    os.name == "nt"
+                    and len(path) > 2
+                    and path[0] == "/"
+                    and path[2] == ":"
+                ):
+                    path = path[1:]
+
+            if os.path.exists(path):
+                return os.path.abspath(path)
 
         if self.url:
             await self._download_file()
             if self.file_:
-                return os.path.abspath(self.file_)
+                path = self.file_
+                if path.startswith("file://"):
+                    path = path[7:]
+                    if (
+                        os.name == "nt"
+                        and len(path) > 2
+                        and path[0] == "/"
+                        and path[2] == ":"
+                    ):
+                        path = path[1:]
+                return os.path.abspath(path)
 
         return ""
 
diff --git a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
index 99ea727315..7e42a0fd86 100644
--- a/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
+++ b/astrbot/core/platform/sources/aiocqhttp/aiocqhttp_message_event.py
@@ -45,6 +45,19 @@ async def _from_segment_to_dict(segment: BaseMessageComponent) -> dict:
         if isinstance(segment, File):
             # For File segments, we need to handle the file differently
             d = await segment.to_dict()
+            file_val = d.get("data", {}).get("file", "")
+            if file_val:
+                import pathlib
+
+                try:
+                    # 使用 pathlib 处理路径，能更好地处理 Windows/Linux 差异
+                    path_obj = pathlib.Path(file_val)
+                    # 如果是绝对路径且不包含协议头 (://)，则转换为标准的 file: URI
+                    if path_obj.is_absolute() and "://" not in file_val:
+                        d["data"]["file"] = path_obj.as_uri()
+                except Exception:
+                    # 如果不是合法路径（例如已经是特定的特殊字符串），则跳过转换
+                    pass
             return d
         if isinstance(segment, Video):
             d = await segment.to_dict()