What is a file extension?Short answer: it's the set of letters after the period (.) in the name of a file. Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems. In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file. Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse! |
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| ABCDEFGHIJKLMNOPQRSTUVWXYZ | |||||
| OLD - Extension Details | |||||
| Date Added: | January 01, 1970 | ||||
| File Extension: | .OLD | ||||
| Description 1: | The .OLD extension is associated with backup files. It generally serves as an indicator for backup copies of files, attached to filenames when newer versions of the files are saved or created by a particular program. File extension .OLD is usually placed at the end of the filename, coming after the original or initial file suffix. Program software may create .OLD files automatically, but they may also be generated by users. In order for the files to open right, it might be necessary to delete the .OLD extension. | ||||
| File Type: | Backup file | ||||
| Mode: | Binary | ||||
| Program(s) to Open: | Mac and Windows: original program used to create file | ||||
| Common: | |||||
| Extension: | |||||
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