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File Extension

BAK File Format

Backup file

BAK is a file extension for a file format typically used when creating a backup copy of a file. 

Normally, a BAK file is created as an automatic backup when an application is editing or making changes to the file in question. Certain database applications use BAK files when making a backup copy of their database. 

Mozilla Firefox also uses “bookmarks.bak” file to make an automated bookmarks backup.

 

Learn more about .BAK files:

ITKnowledgeExchange.com offers hundreds of questions and answers about backup and recovery.

SearchStorage.com offers tutorials, news and expert advice related to backups.

This was last updated in July 2010
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I found these files in my recycle bin (over 500kb and 250kb because I wondered whether to restore them as I am trying to get rid of a BT helpdesk dialogue popup which I get every time I start up the laptop and a explorer line entry popup as well. This all occurred when I cleared out some programmes to help restore the speed of the laptop
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