The MpAvDlta.vdm file contains the antivirus delta definition module. This file is usually updated multiple times per day by Microsoft and contains all the changes that have occurred since the last antivirus base was created. The MpAsBase.vdm file contains the antispyware base definition module.

Improve Windows Defender baseline (engines, platform and security intelligence update) in OEM disk images using monthly updates and guideline to optimize during factory mode - Microsoft Support.

Status. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Describes the symptoms of a data corruption problem that may occur on computers that have Forefront Client Security installed. Provides workarounds for this problem.

绝大多数的特征码更新应该应用于代理程序使用的引擎，并从当月的基本文件。 在此情况下，只有 delta 文件 （MpAvDlta.vdm 和 MpAsDlta.vdm） 需要更新。 使用最新版本的反恶意软件定义的代理会接收到增量文件的二进制差异增量更新。

Resolution. After you apply this update, all malware detected in a scheduled scan is automatically taken action upon regardless of the detection type (concrete, generic, or heuristic) when a Forefront Client Security policy is deployed.

Status. Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Describes a hotfix rollup package that is available for the Forefront Client Security anti-malware client.

El archivo MpAsDlta.vdm contiene el módulo de definición de delta de antispyware. Este archivo normalmente se actualiza varias veces por semana por Microsoft y contiene todos los cambios que se han producido desde que se creó la última base de antispyware.

Symptoms. You experience the following symptoms when you are using Microsoft Forefront Client Security. Symptom 1. On a computer that is running Microsoft Windows 2000 Service Pack 4, the Anti-malware user interface cannot open when you log on to the computer by using a non-administrator account.

Microsoft has identified an issue in the Forefront Client Security agent on Windows 2000 which prevents the kernel-mode mini-filter driver, mpfilter.sys, from properly loading. This issue is specific to agents running on Windows 2000 and the Client Security October update and does not occur on other operating systems.

MpAvDlta.vdmファイルには、デルタのウイルス対策定義のモジュールが含まれています。 このファイルは、通常 1 日に複数回が Microsoft によって更新され、最新のウイルス対策ベースが作成された後で発生したすべての変更が含まれています。