My understanding (not sure how accurate or up-to-date) is that Windows still opens some file formats using Internet Explorer (possibly depending on other OS/dom

My understanding (not sure how accurate or up-to-date) is that Windows still opens some file formats using Internet Explorer (possibly depending on other OS/domain settings). The Windows Help File (.chm) or something similar comes to mind. Also worth pointing out that security researchers targeting specific platforms/applications (say a specific version of older Windows where one particular organization has applications which require a specific version of IE) might be a valuable stack for the researcher to spend time on. That said, those stacks/environments should be treated like a meth lab: you want to be very careful what you do with it and it shouldn’t be commingled with where you live and play.