diff --git a/onebot/src/main/kotlin/client/core/Bot.kt b/onebot/src/main/kotlin/client/core/Bot.kt
index d183ad2c..64b60bed 100644
--- a/onebot/src/main/kotlin/client/core/Bot.kt
+++ b/onebot/src/main/kotlin/client/core/Bot.kt
@@ -19,6 +19,7 @@ import cn.evolvefield.onebot.sdk.response.misc.*
 import cn.evolvefield.onebot.sdk.util.*
 import cn.evolvefield.onebot.client.config.BotConfig
 import cn.evolvefield.onebot.client.handler.ActionHandler
+import cn.evolvefield.onebot.sdk.response.ext.GetFileResp
 import com.google.gson.*
 import me.him188.kotlin.jvm.blocking.bridge.JvmBlockingBridge
 import org.java_websocket.WebSocket
@@ -1428,4 +1429,19 @@ class Bot(
         val result = actionHandler.action(this, action, params)
         return result.withClass()
     }
+
+    /**
+     * 获取群或好友文件信息
+     *
+     * LLOnebot, NapCat
+     * @param fileId 文件ID
+     * @return [ActionData] of [GetFileResp]
+     */
+    suspend fun extGetFile(fileId: String): ActionData<GetFileResp> {
+        val action = ActionPathEnum.EXT_GET_FILE
+        val params = JsonObject()
+        params.addProperty("file_id", fileId)
+        val result = actionHandler.action(this, action, params)
+        return result.withToken()
+    }
 }
diff --git a/onebot/src/main/kotlin/sdk/enums/ActionPathEnum.kt b/onebot/src/main/kotlin/sdk/enums/ActionPathEnum.kt
index ec472bc6..d7faeb32 100644
--- a/onebot/src/main/kotlin/sdk/enums/ActionPathEnum.kt
+++ b/onebot/src/main/kotlin/sdk/enums/ActionPathEnum.kt
@@ -291,5 +291,12 @@ enum class ActionPathEnum(
     /**
      * 获取群文件下载链接
      */
-    GET_GROUP_FILE_URL("get_group_file_url")
+    GET_GROUP_FILE_URL("get_group_file_url"),
+
+    /**
+     * 获取文件下载链接
+     *
+     * 属于 LLOnebot, NapCat 扩展 API
+     */
+    EXT_GET_FILE("get_file"),
 }
diff --git a/onebot/src/main/kotlin/sdk/response/ext/GetFileResp.kt b/onebot/src/main/kotlin/sdk/response/ext/GetFileResp.kt
new file mode 100644
index 00000000..92ee0d7b
--- /dev/null
+++ b/onebot/src/main/kotlin/sdk/response/ext/GetFileResp.kt
@@ -0,0 +1,20 @@
+package cn.evolvefield.onebot.sdk.response.ext
+
+import com.google.gson.annotations.SerializedName
+import lombok.AllArgsConstructor
+import lombok.Data
+import lombok.NoArgsConstructor
+
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+class GetFileResp  {
+    @SerializedName("file")
+    var file: String = ""
+    @SerializedName("file_name")
+    var fileName: String = ""
+    @SerializedName("file_size")
+    var fileSize: Long = 0
+    @SerializedName("base64")
+    var base64: String? = null
+}
diff --git a/overflow-core/src/main/kotlin/top/mrxiaom/overflow/internal/contact/data/RemoteFilesWrapper.kt b/overflow-core/src/main/kotlin/top/mrxiaom/overflow/internal/contact/data/RemoteFilesWrapper.kt
index a6b09337..49de3afc 100644
--- a/overflow-core/src/main/kotlin/top/mrxiaom/overflow/internal/contact/data/RemoteFilesWrapper.kt
+++ b/overflow-core/src/main/kotlin/top/mrxiaom/overflow/internal/contact/data/RemoteFilesWrapper.kt
@@ -12,6 +12,7 @@ import top.mrxiaom.overflow.internal.message.data.WrappedFileMessage
 import top.mrxiaom.overflow.internal.utils.toMiraiFiles
 import top.mrxiaom.overflow.internal.utils.toMiraiFolders
 import top.mrxiaom.overflow.spi.FileService
+import java.net.URLEncoder
 import java.util.stream.Stream
 
 internal class RemoteFilesWrapper(
@@ -205,7 +206,13 @@ internal class FileWrapper(
     }
 
     override suspend fun getUrl(): String? {
-        return impl.getGroupFileUrl(contact.id, id, busid).data?.url
+        when (contact.bot.appName.lowercase()) {
+            "llonebot", "napcat" -> {
+                val file = contact.bot.impl.extGetFile(id).data
+                return file?.file?.run { "file:///${URLEncoder.encode(this, "UTF-8")}" }
+            }
+            else -> return impl.getGroupFileUrl(contact.id, id, busid).data?.url
+        }
     }
 
     override suspend fun moveTo(folder: AbsoluteFolder): Boolean {