A BAK file is a backup of another document or file, commonly created automatically by software programs or by the operating system. It typically contains a copy of the original file and can be restored to the original by replacing the .bak extension with the original extension.

Often BAK files are created by simply appending .bak to the original filename. For example, document.doc may have a backup file document.doc.bak. NOTE: An example program that uses the ".bak" extension is AutoCAD. Windows may also create BAK files for the System.ini and Win.ini files.

A BAK file is a backup of the Google Chrome or Mozilla Firefox bookmarks file, which can be used to replace saved bookmarks in case the main bookmarks file becomes corrupt. It is automatically generated by the Chrome or Firefox web browser and is typically named bookmarks.bak.

If Chrome creates a bookmarks.bak file, it is located in the following directories with a Bookmarks text file in Windows and macOS: Windows: C:Users\[username]\AppData\Local\Google\Chrome\User Data\Default macOS: /Users/[username]/Library/Application Support/Google/Chrome/Default If Firefox creates a bookmarks.bak file, it is located in the following directories with a Bookmarks text file in Windows and macOS: Windows: C:\Documents and Settings\[username]\Application Data\Mozilla\Firefox\Profiles\[random-name] macOS: /Users/[username]/Library/Application Support/Firefox/Profiles/[random-name].default

File created by Finale, a music notation application for playing instruments, vocals, etc.; replaced by the .BAKX file, which was released in Finale 2014; contains backup data for .MUS files; created when MUS files are saved by the user.

To create a BAK file: You must first enable the backup creation option. Select Finale [version] → Preferences.... Select "Save and Print" in the list on the left of the "Preferences" window, check the "Make Backups When Saving Files" checkbox, and click OK. Now when you save your MUS file, a BAK file will be created.

A BAK file is a backup file created by Wondershare MobileTrans, a program used to backup and transfer data from and to devices. It contains data backed up from a device, such as contacts, messages, calendar information, call logs, photos, music, videos, apps, and app data.

BAK files are the primary file type associated with MobileTrans. The file is created when backing up a phone to a computer. To do this in MobileTrans, click "Back Up Your Phone" on the homepage of the program, select the content to backup, and click "Start Transfer". The BAK file will then be created to store the backup data and placed in the following directory: C:\Users\[username]\Wondershare\MobileTrans\Backup To restore a BAK file to a device in MobileTrans, click "Restore From Backups" on the homepage of the program, click "MobileTrans", select the BAK file you want to restore, and click "Start Transfer".

A BAK file is a backup file created by Terraria, a 2D action adventure and sandbox construction game. It contains a copy of a world (.WLD file) or a player (.PLR file) in Terraria. BAK files are used for storing a backup of a WLD or PLR in the event that the file becomes corrupt or lost.

BAK files created by Terraria are simply WLD or PLR files but with the .bak file extension added to the file. For example, a backup of the example.wld file appears as example.wld.bak. If you need to open the backup file in Terraria, remove the .bak extension and place the file in the appropriate folder. WLD files should be placed in the following directory: [user]\Documents\My Games\Terraria\Worlds\ PLR files should be placed in the following directory: [user]\Documents\My Games\Terraria\Players\