The Petz Community has been wanting to make an open-source re-implementation of the PF Magic Petz games for a few years now. The original devs still have the source code, but the rights to the source code belong to Ubisoft, so they can't share the code without fearing legal action. The community made a petition to Ubisoft a while back, but Ubisoft seems too uninterested in even what scraps remain of the Petz' brand name's corpse to give a shit. As a result, the handful of fans who actually know code (led by Reflet@Yabiko) are slowly, painfully, trying to reverse-engineer the game code directly from the compiled C++ code of the game itself.
In roughly 15 years' time, the game's internal date-keeping systems will cease to work, and it will no longer be able to run properly without, bare minimum, changing your PC's system clock to go years back in time. We need to somehow preserve the game before then. The DOS-based entries (Dogz 1, Catz 1, and Oddballz) are already unplayable without virtual machines; I hope one day we can re-implement those, too.
Petz is a truly unique game series. It has a unique rendering system that attracted a dedicated modding community, and a distinct design philosophy that sets its gameplay apart from other virtual pet games. Something very special will be lost if it ceases to exist.
And that's a 20 year old game with an active fanbase, albiet a niche one. Part of the reason we're still able to play this game at all on modern computers is because of a QoL mod made in 2006 by a programmer no longer in the community. How many PC games from that era aren't so lucky? Neither re-released officially, nor having enough fans to muster up collective maintenance. There was an entire slew of virtual pet PC games from that era that nobody talks about anymore.
And console games, I think, have it worse. And then there's phone games - did you know that there was an entire slew of Professor Layton games for flip phones, released only in Japan? Good luck finding a way to play them. How much games history is buried by a combination of technological obsolescence, and dog-in-the-manger corporations hoarding the legal rights to media while refusing to release it?