Came across this when using Syncfusion's Grid Control.

Their class library reference is a set of compiled help files, to be merged and viewed with VS.NET help. They ship InnovaHxReg.exe with their product to register the help files.

Google groups search shows HxReg.exe is a MS version of this tool, not sure the differences.

Wonder where this ends up writing? Somewhere in the registry I woudl guess...