File with .CDP extension contains additional content for Trainz Simulator game series. Additional content can be in form of extra railroads, scenery, trains or rolling stocks. After installation the additional content ca be found in the game’s installation subfolder WorldDispatcherDownloads.

CDP files are distributed by third-party vendors, for example, Auran. Additional content packages can be downloaded from the internet and managed using dedicated tools. User can install extra content with tools that are a part of Trainz Simulator software such as Content Dispatcher or Content Manager Plus.