BAK File Extension

BAK file icon
Backup Format
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    3.6 (16 votes)

What is BAK file?

Files with the BAK extension are generated by various programs and they are used to store different types of backup copies. Backup copies (as a BAK files) are created for example while saving a document edited by a user (the original version exists under the same name, with the .BAK extension filename added).

Applications such as Microsoft SQL Server use this type of files to store backup copies of its data bases. Backup copies are usually not deleted automatically, therefore, in case of loss of some data, it can be retrieved. Alternative for .BAK extensions are the .ORIG and .OLD extensions. Various programs utilising BAK files, use them to store different types of data, therefore – it is not possible to point out a specific application enabling to open a BAK file.

Frequently encountered BAK files

One of the applications utilising the BAK extension is the popular web browser – Mozilla Firefox. The application uses BAK files to store backup copies of user’s web sites’ tabs. The default name of the file is bookmarks.bak, and usually, it is located in C:Documents and SettingsUserApplication DataMozillaFirefoxProfiles (for Windows system) directory. Copying a given file onto a different device, and placing it in the specified directory, will enable to use the same tabs within a browser.

Programs that support BAK file

We hope we helped you solve the problem with the BAK file. If you do not know where you can download the application from our list, click on the link (which is the name of the program) - you will find more information there on the location where to download the secure setup version of the required application.

What else may cause problems?

There can be more reasons which determine that you are not able to open the BAK file (apart from the lack of the proper application installed).

First - the BAK file may be incorrectly associated with the application installed to support it. In this case, you need to change this association by yourself. To do this, right-click on the BAK file that you want to edit, click "Open with" and then select the program from the list that you have installed. After this operation, the problems with opening the BAK file should be solved.

Second - the file you want to open can simply be damaged. Then, the best solution is to find a new version of given file, or download it again from the same source as before (maybe for some reason in the previous session the download of the BAK file has not been completed and it cannot be opened properly).

Do you want to help?

If you have additional information about the BAK file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on BAK file.

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