With the IE plugin you coul use a launch-action maybe like this:
AFAIK this won't work within the AJAX client but with an extension it should be possible. I don't know if there already exists one which contained these functionality and could be adapted - if not you could use this as a starting point for creating an own ones: https://www.codeproject.com/Articles/668351/HTML-File-API-Capability-and-Compatibility.