What is and How to Open a BAk File in Windows, MAC and online

Backup definition and the linked programs information.

A backup from a specific programs, depends on the software that created it.


How to open Bak Files

The File extension bak is used by the following type(s):

Backup files

Common and mostly used .bak files type it is a copy

The BAK File extension is for a long time used for backup files. Generally .bak files are a backup copy of an original file.

When there is some action, the backup renames the original extension to .bak. Then, it does some steps. Finally the .bak files are renamed back.

So, to restore original file, rename file to its original extension, if you know it, that is.

Similar names and formats are .old or .orig

There are many applications that do this. This is the programs list taken from the wikipedia bak article:

  • Apophysis7X
  • Alteryx
  • Aspell
  • Audacity
  • AutoCAD
  • fluidsim
  • Blue Griffon
  • Cubase
  • DraftSight
  • Family Tree Maker
  • Finale Notepad
  • FoxPro
  • FormZ
  • Google Chrome
  • Grabilla
  • HxD
  • HyperCam
  • JavaFX Scene Builder
  • Lazarus
  • LMMS
  • Minitab
  • Mupen64
  • Notepad++
  • NUPS
  • Opera
  • Outlook Express
  • Password Safe
  • Photoshop
  • PScad
  • Rhinoceros 3D
  • Sony Vegas
  • SQL Server
  • SCIA Engineer
  • Steinberg Cubase
  • Starbound
  • TeamViewer Manager
  • Terraria
  • Texmaker
  • Turing
  • Turbo C++
  • UltraEdit
  • VEE
  • WhatsApp
  • Windows
  • WinMerge
  • Word
  • Zmodeler


The backup process is very important to keep a copy of your files. There is no point in convert these files to other formats.


Programs and Apps

You can download a free download viewer from the following link :