If you have just downloaded PES 2012 (usually a pirated version or a "Repack") and the installer asks for this file, or if the game crashes immediately upon startup, you likely need to apply the "crack."
The Ghost in the Machine: Understanding "rld.dll" in PES 2012 For many fans of Pro Evolution Soccer (PES) 2012
Let’s be clear: It does not replicate itself or steal personal data. However, it is classified as a Potentially Unwanted Program (PUP) or HackTool by most security engines.