Err... to make it smaller?

It's not that important, but still, if you can easily save on some bandwidth why not do it? But to elaborate... I do know, and even use some sort of version control to achieve the same. But for a new "project" I'm looking into packing a script and dependent files into a single exe and that exe won't be used by people who either use batch files or who could implement version control / local caching.