PLEASE HELP!!! New member needing help with installing the fourth age total war

So i download fourth age total war and when its done something pops up asking "in which app would i like to open this". I have been looking around online but cant seem to find an answer to my problem. Im on a dell laptop. dont no if that has anything to do with it.

It might be a problem of your Internet browser.
If you navigate through Internet Explorer, switching to Mozilla Firefox of Chrome may permit you to download the mods successfully.