Does your unidentified camera's brand and model support ONVIF?
https://en.wikipedia.org/wiki/ONVIF
Rather than trying to use a proprietary protocol to access the remote
camera, perhaps you can use the ONVIF open standard. If it supports
ONVIF, you should be able to use a multitude of remote camera apps.
Check the specs on your unidentified IP camera. See if ONVIF is
supported. If so, an online search would help in understanding ONVIF
(
https://www.google.com/search?q=remote%20camera%20onvif). If you find
apps and create or have an environ in which they can run, you can
probably get away without knowing much about ONVIF. Although I have not
gone the route yet, I've read where many users were dissatisfied with
the remote control software included with the IP camera and found other
apps they thought gave them more control or had a better feature set.
I do not have Windows 10 to test but have read that it will run apps
(versus programs). You could also get the Android SDK to use its
emulator to run apps inside of it. I remember reading about an Android
distro that came prepared as a VM disk to use inside a virtual machine.
When Firefox 52 comes out in a few months from now, they will be
dropping NPAPI support. So that old plug-in won't work anymore unless
you keep using an old version of Firefox.
https://support.mozilla.org/en-US/kb/play-windows-media-files-in-firefox
Have you checked if the camera maker has newer software?