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
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.
• 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.
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