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format file old

What is an old file and how do I open an old file?

OLD is an indicator for a backup copy of a file. OLD is appended to a filename when a newer version of the file has been created or saved by a certain program. It is often placed after the original file suffix.

Windows
Mac OS
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Detail old file extension information:
File Type: old
File Format: Backup File
Primary Association: Backup Files
Mime Type: application/x-trash