I started to inspect what the hell Corel Standby Service is used for and why. It is started in the registry Run section at startup.
Iit scans your hard disk - yes, exactly - and then build a list of dlls in a file called StandbyList.dat in the PSP X3 folder. The filename is recorded in the HKEY_LOCAL_MACHINE\SOFTWARE\Corel\Standby\1.0\ImageLists\PaintShop Photo Pro registry key. It keeps on scanning the same files over and over. Sometimes it loads a DLL, probably to read resources.