File Extension BAK

File type: Backup File

About the BAK file type:

If Windows cannot find the appropriate program associated with .BAK files, then your registry may have errors. Check your Windows registry for errors (includes file association errors).

BAK files are generated by a range of software as backup files to store information. As such the format of the data contained varies depending on the format of the file of which they are a duplicate. To establish which package created the particular .BAK file it might be necessary to investigate a little. Firstly you can search through the file using a text editor looking for any hints about the original generator. Alternatively the folder in which the file is sits might also give an indication, as well as the time and date the file was created.