I posted this issue in the Ruffle Help section more than 2 weeks ago, but had no replies. I hope it is acceptable to post here.

I am endeavouring to resuscitate a website that displays Flash interactive aviation instrument simulators. The site is on a Windows 2016 server and needed the Wasm MIME added to the Web.config file.

I have been encouraged to see that all the Flash files are displaying (last Ruffle nightly dated 2021-03-14), although with some issues. The most important issue to be solved is that some of the more complex interactive files have dropdown menus which do not open in Windows using chromium-based browsers, but do open in Firefox and Gecko-based browsers, unless the Override software rendering list. flag is set to Enable. However, even when the drop-down menus do open, selections cannot be made.

As an example, the file in the following link can be opened in Ruffle Demo:
CmpctMultiInstEXT.zip

Any pointers, or help would be greatly appreciated.