.Bak file

In computing, “.bak” is a filename extension commonly used to signify a backup copy of a file.
When a program is about to overwrite an existing file (for example, when the user saves the document he or she is working on), the program may first make a copy of the existing file, with .bak appended to the filename. This common .bak naming scheme makes it possible to retrieve the original contents of the file. In a similar manner, a user may also manually make a copy of the file before the change and append .bak to the filename.
Other naming schemes are also in widespread use: file~, file.orig, file.old, and so on.
Database Applications like FoxPro and SQL Server use .bak files to back up their databases.[citation needed] Many applications, like XML shell, create .bak files in their Autosave process.[citation needed] They don’t get automatically deleted, so they need to be manually deleted after the process using it is stopped.
[edit]List of some applications that use bak files

Finale Notepad
Sony Vegas
SQL Server
XML file
Outlook Express
Steinberg Cubase
HyperCam 2
[edit]External links

BAK file
BAK or BK File Format
FoxPro Commands That Create Backup (.BAK & .TBK) Files


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