FileHandlers and MenuExtensions

FileHandlers

File handlers, once registered are used to try opening files unknown to the GameExtension.
You can ask the editor to try opening a file with the loaded handlers using:

OpenFileHandler.OpenFile(fileName,fileStream);

Implementing the IFileHander interface is pretty simple:

class MyFileHandler : IFileHander
{
	public string HandlerName => "MyFileHandler";

	public bool IsFormatSupported(string filename, Stream file)
	{
		//Check if this class can handle the file, if so return true
		//stream position is always 0
	}

	public void OpenFile(string filename, Stream file)
	{
		//Open a form or converter for the file, this should be non-blocking
	}
}

When your class is completed you just need to add it to the manifest:

public IFileHander[] Handlers => new IFileHander[] { new MyFileHandler() };

MenuExtensions

The IMenuExtension interface is used to add items to the menus of the editor, these menus are always shown no matter the current GameModule, if you want to show a custom menu ONLY for your GameModule (eg. settings) this is not the way to implement it.
To implement a MenuExtension you must provide 3 ToolStripMenuItem arrays, each will be added to the relative ToolStrip in the main window.

class MenuExt : IMenuExtension
{
	public ToolStripMenuItem[] FileMenuExtensions { get; internal set; }
	public ToolStripMenuItem[] ToolsMenuExtensions { get; internal set; }
	public ToolStripMenuItem[] TitleBarExtensions { get; internal set; }
	public MenuExt()
	{
		ToolsMenuExtensions = new ToolStripMenuItem[]
		{
			new ToolStripMenuItem(){ Text = "A button"},
		};
		ToolsMenuExtensions[0].Click += TheClickHandler;
	}
}

the unused arrays can be set to null