How do I download mods? When the box with 'open' and 'save' buttons comes up do I open it or save it? After choosing one of those what do i do?

EDIT: oh, i was looking for a search. just found it down the bottom. normally searches are up the top. Thank you for helping.

Save or open, does not matter. Once you open the file, you should see a folder named (something).rte. Extract that folder and put it in the root directory of Cortex Command with the other .rte folders. While I'm here, to disable it, take it out of that directory or put it in a subdirectory (I have a folder called "off" that I dump them in).

EDIT: Oh, also, please use search next time. This thread would have solved your problem.