File extension old

Name: Backup Files

Popularity: 8

Open With: Ultra File Opener

What is this old file?

The OLD file extension is used for indicator backup file. When a new version of the file has been created, the OLD file will be created, .old extension will append to the filename as the backup file. For example, the original file is "A.doc", the backup file's name will be "A.doc.old".