External Program
This type latches on and executes any executable program (exe). It will pass along the Synthesis command line arguments to inform the program of what it should be patching, and where to put its results.
This patcher type is meant for non-Mutagen based patcher programs that want to participate in a Synthesis patch pipeline. As long as the program can take in the command line arguments, and produce a patch file in the desired location, it can be a patcher within Synthesis.
This patcher type is not typically used with Mutagen-based patchers, as Git Repository or Local Solution are better options.
The only required input is a path to the executable file to run.