What is a .@@@ file?
A file with the .@@@ extension is known as a backup control file. It is used by older versions of Microsoft's MS-DOS operating system, specifically from version 2.0 to 3.2x. This type of file was created by a program called BACKUP, which was included with MS-DOS and also with FreeDOS, a similar system that works on modern computers and mobile devices.
The .@@@ file helps manage the process of restoring files from a backup. It contains important information such as the order of the backup disks (sequence number) and the date the backup was made. This helps the computer understand how to correctly restore the data from the backup disks.
To open a .@@@ file, you need to use the DOS RESTORE program. This program reads the .@@@ file to figure out how to properly load and restore the backed-up data.
More details about this file type include its role in identifying backup disks. Each backup disk created under MS-DOS 2.0 to 3.2x includes a file named BACKUPID.@@@. This file marks the disk as part of an MS-DOS backup set. In FreeDOS, you can create similar backups by using the /v switch followed by "3.2x" when running the backup command, ensuring the backup is compatible with the older MS-DOS format.
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