Skwareblox: I had checked a couple days after that and i tried launching an empty server by myself, unfortunately since gog uses their own launcher stuff to make outlaws work it seems it's incompatible.
F4LL0UT: Note that you can still launch the game directly through the main executable rather than the launcher, although it admittedly seems that even that one is altered. But as I said in a different thread: neither the retail version nor the GOG version works right now, both crash at some point for me when trying to get MP running (curiously at different moments). Can't say for sure if there are really any notable additional problems with GOG's version.
Skwareblox: Hopefully gog will add multiplayer support to games they can through their own service like they did with avp 2000 and hopefully this will be one of them.
F4LL0UT: Galaxy is supposed to be a Steam-compatible API that developers can easily implement in their own
new games. AvP 2000 just happens to be an old game whose developers still have access to the source code and are willing to put some work into re-releasing it - that's an extremely rare and special case. Sadly there's no sign yet that GOG can or will use Galaxy to restore multiplayer in old games whose publisher/developers aren't going to do it themselves.
I figured they might add support in the same way that game ranger does when possible, not that they change source code or anything since game ranger as far as i know has nothing to do with changing source code or specially patching anything to work with their services. I already knew how incredibly rare and unlikely that already is that avp 2000 was indeed a very special case. There are other clients that do properly support outlaws for multiplayer much better then game ranger but ports is one of those issues that always gets in the way in using any of those.
Main executable launching even without the use of game ranger crashes for most so i don't think that works. Nobody seems here to have tried launching a game manually through the in game menu either or just haven't talked about it so i don't know if that works, i have launched a server and played by myself but i'm clueless as to whether or not connections can actually still be made that way.