OLD File Extension

Have a problem opening a .OLD file? We collect information about file formats and can explain what OLD files are. Additionally we recommend software suitable for opening or converting such files.

What is the .OLD file type?

Meaningfully concise, the filename extension .old has become a conventional method of denoting backup copies across many operating systems and platforms. Whether appended manually or in a programmatic way, the .old suffix designates a filesystem entity (either file or folder) which is excluded from use and kept for backup purposes and also to revert any later changes made to it, if necessary. It may be a document, a configuration file, a system or user's folder, or any other data file. A most notable example would be the Windows.old folder created as a backup during the upgrade or repeated installation of the Microsoft Windows operating system. The .old filename suffix is also often manually added when making changes in important configuration files so as to keep the old, unaltered version intact.

Extensions like .old just designate the file's or folder's role, without providing any clues as to the file's true internal format or purpose. In cases of files, the .old extension is normally simply appended to the original filename and extension, making the actual file type evident and easily restorable.


Software to open or convert OLD files

You can open OLD files with the following programs:
Notepad++ by Notepad++ Team
PSPad editor
PSPad editor by Jan Fiala
VLC media player
VLC media player by VideoLAN
NoteTab Light
NoteTab Light by Fookes Holding Ltd

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