If the file is completely missing, you can manually place a new copy in the correct folder:
Alternatively, you can limit the CPU affinity using a script before launching, as outlined in the EA Forums . the sims medieval rlddll error link
RLD.dll itself depends on the Visual C++ 2010 Redistributable (x86). If that is missing, you'll get a cryptic "RLD.dll not found" even when the file exists. Install vcredist_x86.exe from Microsoft. If the file is completely missing, you can