If you search for you will find dozens of websites promising the file. Downloading DLL files from these sites is highly risky.
It helps bridge the game code with the system, allowing the game to think it is running in a valid, registered environment. Why Is the "Orangeemu64.dll Missing" Error Occurring? orangeemu64.dll download
It is frequently associated with "emulator" tools used to play games without needing the original licensing platform or to bypass DRM (Digital Rights Management). If you search for you will find dozens