DOCUMENT:Q102813  21-NOV-1999  [msdos]
TITLE   :Backup Err Msg: Incorrect DOS Version
PRODUCT :Microsoft Disk Operating System
PROD/VER:MS-DOS:6.0,6.2,6.21,6.22
OPER/SYS:
KEYWORDS:

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft MS-DOS operating system versions 6.0, 6.2, 6.21, 6.22 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you try to run the BACKUP command from an MS-DOS command prompt or a
third-party application, you may receive the following error message:

   Incorrect DOS Version

CAUSE
=====

This error can be caused any of the following conditions:

 - You upgraded to MS-DOS 6.0 or 6.2 from MS-DOS 5.0.

   The BACKUP command in MS-DOS 5.0 is an .EXE file. In all previous versions of
   MS-DOS, BACKUP is a .COM file. When you install MS-DOS 6 Upgrade or MS-DOS
   6.2 Upgrade, Microsoft Backup removes only those files that it is replacing.
   Therefore, both the BACKUP.EXE and BACKUP.COM files may remain in the MS-DOS
   directory. MS-DOS looks for files to execute in the following order: .COM,
   .EXE, and lastly .BAT. The error occurs because the BACKUP.COM file from a
   previous version of MS-DOS is still somewhere on the system and MS-DOS is
   attempting to execute it.

 - The SETVER version table has the wrong version listed for Backup.

 - The number "1" is the last digit in the SETVER entry. For example, the
   following entry causes the above error message:

   setver backup.com 4.01

 - You manually expanded BACKUP.EXE from the MS-DOS 6.0 or 6.2 Supplemental
   Disks (instead of running the SETUP.BAT file.

WORKAROUND
==========

To work around this problem:

1. Type the following from the root directory to display the directory listing
   of all files named BACKUP on the drive:

   " dir backup /s " (without the quotation marks)

2. If you have a BACKUP.EXE file, delete any BACKUP.COM files on your system.

3. If you do not have a BACKUP.EXE file, use the SETVER command to set the
   correct version for BACKUP.COM. Set the version to your previous version of
   MS-DOS or to the version of MS-DOS that matches your MS-DOS Supplemental
   Disk. For example, type "setver backup.com 4.00" (without the quotation
   marks) at the MS-DOS command prompt and then press ENTER.

   If you expanded Backup from the MS-DOS Supplemental disks, delete BACKUP.EXE
   from the SETVER version table. For example, type "setver backup.exe /d"
   (without the quotation marks) at the MS-DOS command prompt, press ENTER, and
   then restart your computer.

Additional query words: msbackup 6.22 6.00 6.20

======================================================================
Keywords          :  
Technology        : kbMSDOSSearch kbMSDOS621 kbMSDOS622 kbMSDOS620 kbMSDOS600
Version           : MS-DOS:6.0,6.2,6.21,6.22

=============================================================================

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