Yes I use Firefox, naturally. But I'm also accustomed to using custom protocols like nxm, it works for every custom protocol handle I create. The only thing it does is opening an app with the URI as a parameter, Firefox does that quite well without flaws.
When I open Vortex manually through terminal with the nxm link it doesn't work either, which it should no matter what browsers you have installed.
Conclusion is that it is a problem with Vortex as it doesn't work without browser either.
Edit: I did find what was wrong, btw. It's that Vortex requires an argument switch '-d', that makes it incompatible with most browsers usage of automatic protocol handling, unless it's installer automatically adds those commands to each. You can find the command that is registered with Windows at `Computer\HKEY_USERS\S-1-5-21-277564299-4129582652-396546724-1000\Software\Classes\nxm\shell\open\command`.
Vortex can easily fix this bug by checking if the first parameter starts with `nxm:`
