If its an Intel chipset then you can just download the Intel® Chipset Software Installation Utility in .zip format. Then all you need to do is extract the files and add them in under the "Other" section. This has worked for me so far.
HII will handle any type of driver that has an inf file associated with it, or a txtsetup.oem (such as MSD drivers). At this time it will not work with any drivers that require an executable file to be run. I don't know if there is already an enhancement request at the enhancement request portal, but if not then this sounds like something that would be a good idea to put in there.
Link to add enhancement requests: