You can report an issue on Windows by following the procedure described for example here: https://www.howtogeek.com/368667/how-to-report-a-problem-or-send-feedback-about-windows-10

Regarding SingleFile, please post your feature requests or issues here: https://github.com/gildas-lormeau/SingleFile/issues

EDIT: To fix this issue, I recommend you to take a look at SingleFileZ here: https://addons.mozilla.org/firefox/addon/singlefilez