If you don't have money to buy Empires at War, you'll be able to play Star Wars in your The First Decade package (or original C&C 95, even on C&C DOS version) with Command & Conquer Meets Star Wars mod. The screenshot belows shows the work in progress "REAL Scrap Refinery" featured in the mod:

Also, checking Command & Conquer Meets Star Wars site, you'll find a cool tutorial to make the DOS version of C&C run on Windows XP. Hard to believe, heh? This and other cool goodies can be found there, including how to fix some covert operation bugs found in The First Decade.