RTP is a system for reducing the total size of a game file made with RPG Maker. RTPs contain the graphics, music, and .dll files used when creating a game. Once a game is made with RTP data, you do not need to include material data like music or graphic files. This significantly reduces the file size of the game.
If RTP has been installed, material files needed for the game will already be on your hard drive. With RTP installed only a minimal amount of data is needed to download and play a game.
If RTP is not installed you will need to download material data for the game as well a game itself. This will make the game file much larger than it needs to be. You can't use the program without RTP
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