Nothing.
To keep Hitman: Absolution Professional Edition running smoothly: Nothing
Rarely, Windows System File Checker (SFC) can conflict, or a recent Windows Update changes the security permissions in the C:\Program Files (x86)\ directory, blocking the DLL from loading. Nothing
Antivirus software sometimes flags this file as a "false positive" and moves it to quarantine. Check your security software's history and restore the file if it was flagged [3, 4]. Nothing
Which are you running (Windows 10, 11, etc.)?