I have received a file of .bak format, let it be
foo.bak. I don't know if it is a MS-DOS file or Linux/Unix file. What I know is that I can't open it because my Linux (Ubuntu) does not give any hint how to open it.
So, how I open this file?
Just to omit warnings about not knowing what I am doing:
Disclaimer: I received my file from a known place, it is not a virus. It is a soft copy of one system I should next work on. I just do not happen to know how to open it.