If you want a hassle-free, secure experience without DLL errors, purchase a recent version of eFootball or use a console version of PES 2012.
If the file is completely gone, you can manually replace it. Locate a Source: Some users find the file on Google Drive archives or reputable DLL repositories. Placement: Paste it directly into the root folder where PES 2012 is installed (usually C:\Program Files (x86)\KONAMI\Pro Evolution Soccer 2012 Download Rld.dll Pes 2012