I don't think the problem is a copied file or the speed of your internet connection. Although I don't know any specifics, I'd guess your problem has to do with the first part of step 2 or Note1 in this guide on making a server. Basically, from what I know, if you're using a router, you have to go to the settings for it and "port forward" port 29887, if you want your game to be joinable by people around the world. Looking up "port forwarding" may help, as the method of doing it varies from router to router. In general though, you'll probably need the person that set up the router, because routers often require a username and password to make changes.
A lot of people seem to find "port forwarding" difficult, or more often impossible, because they're working in a position where they can't reach or can't convince the person that set up the router or network. Since you're on the same LAN, however, it may be possible to use Known Address Connection as Note1 mentions in order to avoid having to do port forwarding. You can find the number (actually series of four numbers separated by periods) that you need to put into there by running cmd on the computer (of the non-hosting player) and then typing ipconfig in there. One of the "numbers" on there will be the one you have to type in: it may start similarly to the one listed for "default gateway". I'm not sure how well this will work, or if it will work at all, for you, though it worked for me about ten minutes ago when I tested it on my network.
P.S. If you're going to ask a question like this, it's better to start a new topic for it in a relevant forum, like this one, instead of posting it on an ancient, unrelated topic where the last person the last person before you posted more than three years ago.
P.P.S. This isn't much of an "online gaming community" anymore, since so few people play anymore. Don't be surprised if people don't reply to your posts, because barely anyone logs on to the forums either. There are a few people interested in playing the game online again (including me), but often issues (like the problem with "port forwarding") stop them from making joinable servers. Do note that one person is going to be putting up a server tonight at around 8:00 PM EST (Eastern Standard Time) - you may want to get on Gate 88 then and see if you can join their server. I may not be able to make it to that server tonight because of travel reasons, unfortunately.