> I'd love to see how that worked ...
You need a nim.exe but you don't need anything installed. You can create a self-extracting zip file (called installnim.exe, or setupnim.exe, etc.) containing the nim executable, the script, and anything else needed. You can set up the self-extractor to run a command after extracting; see, e.g., [http://stackoverflow.com/questions/27904532/how-do-i-make-a-self-extract-and-running-installer](http://stackoverflow.com/questions/27904532/how-do-i-make-a-self-extract-and-running-installer)
