Backup Err Msg: Incorrect DOS Version (102813)

The information in this article applies to:
    Microsoft MS-DOS operating system 6.0
    Microsoft MS-DOS operating system 6.2
    Microsoft MS-DOS operating system 6.21
    Microsoft MS-DOS operating system 6.22

This article was previously published under Q102813


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


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 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.


To work around this problem:

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

    dir backup /s

    If you have a BACKUP.EXE file, delete any BACKUP.COM files on your system.
    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 4.00 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 at the MS-DOS command prompt, press ENTER, and then restart your computer.

Modification Type: Major Last Reviewed: 11/21/1999
Keywords: KB102813