Toolkit to make your own Dolmexica Infinite game for Dreamcast. It is part of the Dolmexica Infinite download. Part of this kit are a .bat file that is used as a command line tool as well as a program that serves as a graphical interface for it. The program is contained in the root folder, the .bat file can be found inside the dreamcast folder.
Open "Dolmexica Infinite Make-your-own-game kit for Dreamcast.exe"
To mod the game, change the files in assets just like you would with Mugen (only difference is that you must avoid minuses in file names).
If you want your own IP.BIN data, edit dreamcast/ip/ip.txt
If you want your own boot logo at the license screen, edit dreamcast/ip/INSERT.png (just remember you have to use a paletted 320x90 image with no more than 128 colors for that one)