What type of file was it ? usually you just copy the files (first unzip if necessary of course) to the "Override" folder, then you can hack them into the game using CLUAConsole cheats or an editor like Gatekeeper (you have info about hacking in the Ironworks, in the BG page).
------------------
"Captive, captive... captive in heaven" -Ertai, Captive of the Blinding Angel