Microsoft Backup Err Msg: Alert! Unknown Compression of File (101559)


The information in this article applies to:

  • Microsoft MS-DOS operating system 6.0
  • Microsoft MS-DOS operating system 6.22
This article was previously published under Q101559

SYMPTOMS

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

CAUSE

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.

WORKAROUND

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.
Modification Type:MajorLast Reviewed:11/19/1999
Keywords:KB101559
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