The only way is to have each laptop have its own server running, and put the files in that. The problem you have with using it locally, is it changes the
file:// hence the parent issue. There are no parents when dealing with files.
So you cannot trick the browser, as it knows where it’s getting the file for the iframe from. You can only put the application in a server environment so the conversion does not take place.
Look at the laptops, see what version of Windows they run, and how hard it would be to set up local servers.