I installed a clean GOG.com version of SWAT 3 on my brother's computer and his friend's laptop, with no modifications to either of them. When we tried to play LAN, we ere able to see each other in the LAN lobby and see games created on either computer, but neither computer could join the other's game, because "your data files do not match the host's" or something like that.

Anyone have any clue why this might be happening?

Having the exact same problem

Try re-installing. Run it in XP comp. mode to see if there's easier connectivity.

Was anyone able to fix this? I too am having this issue and have yet to be able to resolve it.

Here's the fix:

The easy way: go to your SWAT 3 folder and move all files called "unins000" something to a different folder. I think you might need them if you want to uninstall the game or something.

The proper way: go to your SWAT 3 folder and rename the unins000.dat file. If you can't see this file, you may have to enable displaying hidden and system files. You can find the appropriate settings by opening any folder and selecting Tools -> Folder Options... -> View tab. On Windows Vista and 7 you may need to press Alt in order to display the folder window's toolbar.


Btw if you want to play tactical coop in SWAT 3, find me on Steam or in the Tunngle lobby. I'm Predatorium with the Far cry 3: Blood Dragon profile pic.

I can confirm that "the easy way" works.

In addition to Predatorium's fix, I have found that the offline installer and Galaxy installed versions were incompatible with each other (...really?).

It shouldn't be tho.There is absolutely no difference in the game files except for the fact that the Galaxy installer comes with the stub version of GOG Galaxy but that isn't located inside the SWAT 3 folder.Double check that ;).Cheers

Well, I'm not sure what the difference would be between the 'unis000' files either, but removing them worked anyway.

To clarify, I have one install (downloaded through Galaxy) of SWAT 3 on my PC. I wanted to play LAN with my brother, so I installed SWAT on my laptop using the offline installer, just to save downloading it again and again. On my laptop, I used the Galaxy 'import folders' to add the SWAT installation to the list. I hosted a LAN game on my PC, which my laptop could see but could not join (red text, data files do not match). On both machines I did the 'verify game files' action, which did not solve the problem. I tried renaming the 'unis000.dat' files on both machines, which did not solve the problem. On my laptop I uninstalled SWAT and reinstalled using Galaxy only, removed the 'unis000' files from both machines and now my laptop can join my PC hosted LAN games.

I agree that the game files should be identical, but it seems SWAT 3 disagrees ¯\_(ツ)_/¯

It has nothing to do with GOG Galaxy at all.The unins000.dat file is added to the GOG games for uninstallation.SWAT 3 probably does an integrity and parity check the moment you try to connect to the host.Any file that isn't originaly part of SWAT 3(written by Sierra) will be detected and the connect request denied.That is for now the only way to play SWAT 3 online until we get our hands on the source code or Activision does something with it which is highly unlikely.