Both of these files are part of your Everquest client installation. The mss32.dll hasn't changed in quite sometime (its datestamp on my computer is 9/4/2002) so if you have a CD containing Planes of Power or up, you might be able to get it by grabbing one of your expansion CD's and installing
TO AN ALTERNATE LOCATION, then copying this file from that alternate location to your eqemu folder.
The DSETUP.DLL is, unfortunately, dated 8/5/2005 so you'd need a recent CD to get that. Maybe -- just maybe -- all it's looking for is that the DLL exists and doesn't actually use the code in it, and if that's the case then you could copy that file from your expansion CD's as well. If the client tries to actually use the code in it, then you might be SOL.
Note that community rules prohibit the use of EQEmulator services to request or facilitate the transfer of copyrighted material, including any EQ Client program file. If you don't have these files, I'm afraid you're on your own in getting them. For more information, see:
http://www.eqemulator.net/wiki/wikka...otPatchWarning