I'd not looked at this before. Great tool for getting started:
Also grab the US Coins file and stick it in the folder where the Emulator is installed under "datazips"
"....All you do is click to download the target package you want, for instance for American coins you would click on Larry P's Incredible 61 target US coins . This will download to your downloads file or wherever you have your downloads go. Open where it is downloaded but do not unzip the file. In a separate window go to your C:\Program Files\EtracEm-V1-en\datazips and then just drag the "61_US_coins.zip" file into the C:\Program Files\EtracEm-V1-en\datazips file. Now your E-Trac emulator has US coins added to it...."