To give you a more specific guide, I need to know a little more about where you found this:
: The number 80689 may refer to a specific Job Number or Application ID . dob.80689.rar
To see what is inside, you will need a file extraction tool: : The native tool for .rar files. To give you a more specific guide, I
If you did not personally download this file from a known source, . dob.80689.rar