I'm going to warn you that whoever explains this needs to talk to me like I'm five years old, because this is something way, way beyond my level of expertise.
In short, I have what I think is a PostgreSQL dump file that someone sent me, and I need to be able to open it up to extract the information. I was expecting a simple tabular format (such as an Excel spreadsheet), but I got something way more complicated (a .backup file). I know how to run some basic SQL queries, but I think whoever sent this to me strongly overestimated my knowledge of database programs. Could someone give me a very, very, VERY simple, completely 110% spoon-fed explanation on how to open this?
(As an aside, I know the person who sent this to me and I know the nature of the file, so I know it's not something completely different.)