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Common File Extensions

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.BAK File Extension 2 File Associations

Run a free scan for .BAK file extension errors.

File Type 1 Backup File  (Most common)
Category Backup Files
Common? Yes
File Description Backup of another document, often created automatically by various programs or the operating system; for example, Windows may create BAK files for the System.ini and Win.ini files.

NOTE: The file extension should be changed back to the original extension in order for the file to open correctly; this is often done by simply removing the ".bak" part of the filename; for example, "mydocument1.doc.bak" should be renamed to "mydocument1.doc" before being opened.
Program(s) that open bak files
Mac OS Mac OS The program used to create the original file
Windows Windows The program used to create the original file
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Updated 1/29/07

File Type 2 Firefox Bookmarks Backup
Category Backup Files
Common? No
File Description Backup of the bookmarks file, which can replace saved bookmarks in case the main file becomes corrupted; automatically generated by the Firefox Web browser; typically named "bookmarks.bak"

Windows: Located in C:\Documents and Settings\UserName\Application Data\Mozilla\Firefox\Profiles\[randon-name]
Mac: Located in Users/[username]/Library/Application Support/Firefox/Profiles/[random-name].default
Program(s) that open bak files
Mac OS Mac OS Mozilla Firefox
Windows Windows Mozilla Firefox
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Updated 2006
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