When Opened in WordPad, or similar, what does this file contain?
echo Running HACK commands to run without an installer
regsvr32 /s HACK\dynamiclinkmarshal\dynamiclinkmarshal.dll
regsvr32 /s MediaCoreMarshal.dll
Ah, sounds more benign, than I had feared. The word "hack," sends shivers up my spine. I always expect the worst.