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 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.
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:
• If you have a BACKUP.EXE file, delete any BACKUP.COM files on your
• 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 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.
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