Wow. This is really unfortunate. I'm really sorry.
Here is what happened:
- When Team17 initially published the game on Steam, they included the file containing all team data (User\Teams\WG.WGT) as part of game files. This had the unfortunate effect that if a user were to reinstall the game, or even "verify integrity" of the game's files, they would lose their teams.
The proper way to fix this would be to change the game's Steam metadata. Unfortunately that is not an aspect of the game that we had access to. We couldn't simply delete the file from the distribution - although that would "fix" the problem causing Steam to delete it when verifying files, it would also delete users' teams when Steam updated the game. Since we didn't know if Team17 would be able to correctly edit the metadata, we opted to fix this in another way.
What we did was work on the assumption that a game update on Steam will not change files that didn't change between the two versions of the game, even if they had changed on the user's disk. We verified this to be true during the testing period. To fix the actual problem, we decided to NOT TOUCH the existing WG.WGT, and instead add code to create and use a backup file (WG.backup-current.WGT), so that uninstalling or re-verifying the game's files didn't wipe your teams.
What we completely didn't account for was GOG Galaxy, and that its behavior might be different than Steam's. Apparently GOG Galaxy will overwrite all files that it thinks are part of the game, whether they changed or not. (We know / have access to GOG even less so than Steam, so this wasn't something we could test.) Unfortunately WG.backup-current.WGT doesn't yet exist at this point, so the file is destroyed by the upgrade. So, in retrospect we should have instead pushed Team17 to fix this properly in both Steam and GOG.
Unless you or your operating system saved a backup (such as the Windows "Previous versions" feature), the only way to get the file back is to recreate it. The following can help:
1. The game saves a replay file of every game played to the User\Games directory. This will include information about your team (team name, worm names, flag, gravestone, fanfare, soundbank).
2. There exists third-party software for editing this file, which can be used to set the progress (missions, trainings...) back to where it was:
https://worms2d.info/Software#Team_editors If you haven't yet updated the game, you can make a backup of the User\Teams\WG.WGT file to avoid this problem.
