If you are seeking information about file extensions, then you are in the right place at right time.

Details of extension .old

0 extension(s) and 1 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .old file?
  • Which program can create the .old file?
  • Where can you find a description of the .old format?
  • What can convert .old files to a different format?
  • Which MIME-type is associated with the .old extension?
Backup Copy File .bak file icon

Backup Copy File

The BAK file is a Backup Copy file. The .BAK is a filename extension commonly used to signify a backup copy of a file.
Category: Other files
Application: -
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
backup, bk, old, ori, orig, ren
Related extensions:
.tjl HP OpenVMS ACL Editor Journal Data
.wbverify Windows Backup Verify File
.mlb HP OpenVMS Macro Library
.lis HP OpenVMS List Data
.wbcat Windows Backup Catalog

Other types of files may also use the .old file extension. If you have helpful information about .old extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

.ol Altair FEKO Charges Data
.omd Routing J Server Data
.ols WinOLS OLS Data
.odl Object Description Language
.ld Autodesk Simulation Mechanical DDAM Summary Data
.lod Homeworld Level of Detail Data

The .old filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

ole (1), okd (1), odl (1), lod (1), ld (1), pld (1), ild (1), omd (1), olv (1), olf (1), ol (1), oid (1), od (1), lld (1), kld (1)

Can't open a .old file?

If you want to open a .old file on your computer, you just need to have the appropriate program installed. If the .old association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.old

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android