https://github.com/m4dEngi/RemotePlayWhatever
the program is free, its safe to use i have antivirus myself and checked it out long ago
kudos to whoever made the other guide before me thats out there somewhere
trying to spread awareness of this awesome program kudos to the maker

description from page

RemotePlayWhatever
Tiny application that lets you force remote play together any game you have in your steam library including non-steam ones.

the program runs simple pretty much
select a friend from your list or create an invite link
no installation required
the wonderful thing is it accesses whats already there just not enabled sometimes <3

because sharing information like this is major and everyone should be able to enjoy multiplayer <3

many games have been released long before remote play but the developers and publishers may not be as active and remote play from what ive learned must be enabled in games seems

so this allows us to play games new and old with friends online including those not on steam
were as in the past we may not have been able too sadly missing out
with the revival of so many old classics it also means we can play multiplayer with others
even if the developer/publisher forgets to enable remote play or for whatever reason is unable too

so have fun have a blast playing multiplayer with remote play
as well as those which it may not already be activated on <3