Project 64 HELP!?!?

Okay so I'm new to all this, first of all.I got the project 64 emulator, and ive been trying to download n64 ROMs. I downloaded Star Fox 64 and saved it to my desktop. I open the file and an internet brower opens for a sec then closes again. a Download window opens that says "open" "save" "cancel"
And when i click open, it just opens a browers for a second again then closes. How do I get the ROMs to work??? Please help...

You have to extract the file with WinRar.http://www.rarlab.com/download.htm

Check the size of that file, if it has a large size, change the extension of that file to .rar.

also make sure you use a (U) or (E) rom, with an (!) in the title. the (!) means it's a clean dump. Also note that the emulator is not perfect, so if you have some lag or sketchy graphics, that's completely normal (for the time being).