Associating filename pattern with plugin?

In short, is there a way to specify that a custom filename pattern applies not to one of the built-in known file types, but to a file type handled by an existing plugin?

More specifically, I'm working with an idiosyncratic embedded system codebase, in windows, which uses a collection of makefiles with the file extension ".make" and it would be great to at least have the syntax highlighting from the built-in Makefile plugin, even if there's no hope of it managing the custom project structure.