Most likely it is missing for him because he has UF not SoD. That is a common issue in the Underfoot client and is resolved easily by copying files over from another install. More details on that in the link here:
http://www.eqemulator.net/wiki/wikka...ssingFilesList
Even if you did get the actual SoD client originally, you probably didn't take the advise to move it out of the Steam folder it installs to. Then, when UF replaced it, Steam updated your install to UF.