Ruby Code for copying TXT to HTML files

Below is code that I wrote to copy the TXT files to HTML files. I am sure that there are better ways to do this. Any feedback to mark@msquaredweb.com is appreciated.

fileNames = {
	"1" => "January",
	"2" => "February",
	"3" => "March",
	"4" => "April",
	"5" => "May",
	"6" => "June",
	"7" => "July",
	"8" => "August",
	"9" => "September",
	"10" => "October",
	"11" => "November",
	"12" => "December"
}

origindir = "C:/DirNameHere/"

fileNames.each {|key, value|
	system("copy","#{origindir}#{key}.txt", "#{origindir}#{key}.html")
}