CFS1 utilized a new flight sim engine when it was released in 1998, with superior graphics. The graphics and game engine were actually a preview of Microsoft Flight Simulator 2000 (FS2000), and NOT Flight Simulator 98 (FS98) as many believed. Combat Flight Simulator could incorporate scenery from either Microsoft Flight Simulator 98 or 3rd party scenery and also numerous 3rd party developed add ons were created. CFS1 is designed with an Open architecture so that third party Add-ons can be devolved without risk of violating copyright infringement laws. The CFS1 ground scenery was very limited and used .BMP files for the entire ground so many designers expanded this game with Freeware to encompass: World flight; Hundreds of Flyable Aircraft; Varied flight utilities; and many other additional files and upgrades for this game. Several websites are devoted to the free distribution of these add-ons. Online multiplayer games are posted at Tradeip Flightboard Network (see ‘external links’ below). Internet play is very possible with only a dial-up connection, and broadband connection works very well.