Files with the BAK extension is basically used for general backup files. A large number of computer processes and applications make use of the BAK file format to create the backup of documents that the application has created.
The BAK file format is a general file type that are created by the auto-save function that are available in most of the computer programs. For instance, when you have edited a file in Microsoft Word and the auto-save feature pops up, a BAK file extension will be created. These files are generally deleted automatically by the program that generated them when the file is no longer required.
In addition to the problem described above, i.e. the lack of the appropriate application to support the .BAK file, there may be several reasons that cause problems with opening and operation of the data format:
A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .BAK file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .BAK file, so download the update and check again.
If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:
It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.