It uses an OCX called TwistedPixel. You can't compile the VB6 code without a developer's license. (I mean this literally, not legally.) I actually managed to track down the original developer of TwistedPixel (much to his surprise) but even he has lost the original code ... so no license file. Also, if you want to rewrite the TwistedPixel.OCX you'll first have to intuit what it does by how it's being used (based on examining the H&E source code calls).
Or you could disable the parts that need TwistedPixel, ideally, opening up a large swatch of functionality and then, later, go back and perhaps re-engineeer the code to use something more modern instead of TwistedPixel.