I made a guide to this in the EB install guide. Heres a copy.
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It seams people are having trouble with this, so I thought I would clear it up. I bought the Alexander version of steam (since I forgot to get the real one) and figured this out a little while ago. Firstoff, download EB, and install it into your C:\Program Files\Steam\SteamApps\common\rome total war gold as you have probably have guessed. Download and install EB 1.2 as well. Now comes the harder part. Normally if you had a disk version of the game merely clicking on the EB shortcut that is installed would work, but it targets itself at the TrivialScript, which in turn targets Rome.exe, which with Steam will not work. So heres how to fix it. In Steam, make a desktop shortcut for RTW Gold vanilla. Right click this and click on properties. Under target it should say something like:
"C:\Program Files\Steam\steam.exe" -applaunch 4760
But yours may be different, dont use mine. Copy this. Now right click your EB shortcut (or any, it doesnt really matter) and paste this over what is written in target. Leave a space and paste this:
-show_err -nm -mod:EB
And you'll have something like:
"C:\Program Files\Steam\steam.exe" -applaunch 4760 -show_err -nm -mod:EB
It should work. But I've only tried it with the Alexander expantion, so I'm not 100% sure.
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