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Microsoft KB Archive/101559

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Knowledge Base

Microsoft Backup Err Msg: Alert! Unknown Compression of File

Article ID: 101559

Article Last Modified on 11/19/1999


  • Microsoft MS-DOS 6.0 Standard Edition
  • Microsoft MS-DOS 6.22 Standard Edition

This article was previously published under Q101559


When you try to restore backups with Microsoft Backup for MS-DOS or Microsoft Backup for Windows, you receive the following error message:

Alert! Unknown compression of file


This error occurs when:

  • The backups were made with a beta version of Microsoft Backup. -or-

  • You used MS-DOS 6.22 to create a compressed backup and then attempted to restore it using Microsoft Backup for MS-DOS 6.0.


If you made backups with a beta version of Microsoft Backup, there is no workaround for this situation. You must create new backups with the final release version of MS-DOS 6.0 or later.

If you made backups under MS-DOS 6.22 Backup with compression turned on, either restore the data with MS-DOS 6.22 version of Backup, or back up the data with compression turned off.

Additional query words: 6.00 back up msbackup mwbackup

Keywords: KB101559