Steam beta makes Proton the default for non-Steam Windows games on Linux

A new Steam client beta automatically runs non-Steam Windows games through Proton on Linux, removing a manual step that has confused new SteamOS users for years.

AI-drafted from 3 sources. This story was written with AI from the outside reporting listed under Sources, and checked by automated tools before it went up. The originals have the full detail.

Valve has quietly changed how Steam handles Windows games that aren't bought on Steam. In a client beta pushed on 7 October, any Windows binary added to Steam as a non-Steam game will now run through Proton by default on Linux, rather than requiring the user to switch on a compatibility tool by hand.

The change was first reported by Phoronix, which covers the beta's other fixes: non-Steam games that previously failed to launch after you changed the target binary via the Browse button should now work, and the in-game Stop button will properly close games launched by external tools. GamingOnLinux publishes the fuller change list from Valve, which also mentions a fix for library playtime occasionally showing the wrong value, a new Big Picture setting to disable the screensaver during play, a Linux-specific bug fix for Steam Input's controller reordering screen, and a firmware fix for Steam Controllers getting stuck in Bluetooth Low Energy mode.

Why this matters for handheld and desktop Linux setups

Adding external games and launchers to Steam has long been the easiest way to get everything into one library and, crucially, into the Gaming Mode interface on devices like the Steam Deck. The snag on Linux was that Steam wouldn't run those Windows binaries through Proton, Valve's compatibility layer built on Wine, unless you dug into a game's properties and switched it on yourself. Most people who've used a Steam Deck for more than five minutes know the drill. People who haven't, don't.

That is the gap this beta closes. One commenter on the GamingOnLinux thread puts it plainly: “A common issue for new users was opening Steam on Linux and seeing that most of their games weren't compatible; they often didn't realize that Proton compatibility could be enabled in the settings.” Liam Squires-Hand, the site's author, frames it as overdue housekeeping rather than a flashy feature, writing that “fixing up a default that has confused users for years now is not newsworthy? Okay then. I disagree.”

Not everyone is convinced it's a big deal

Reaction in the comments is split. One reader, tarmo888, calls it “a tiny UI fix” and notes you could always set Proton manually, pointing out Steam still can't add Microsoft Store games as non-Steam entries, so this isn't quite “add anything.” Another, Savor592, raises a more practical complaint: Steam Deck apparently removed the option to add a non-Steam entry with no compatibility tool at all, which breaks workflows for people pointing Steam at manually downloaded source remakes or Flatpaks that don't need Proton and won't run under it.

That tension sums up the trade-off here. A sensible default helps the people who didn't know Proton existed. It can get in the way of people who knew exactly what they were doing and relied on the old blank-by-default behaviour. Neither source confirms whether Valve plans to restore an explicit “none” option alongside the new default, so that remains an open question.

What's still unclear

Both reports describe this as a beta change, not yet the stable Steam client, so the rollout to everyday SteamOS and desktop Linux users on the stable channel isn't confirmed in either piece. It's also worth remembering Proton's compatibility is still per-game: defaulting to it won't make a troublesome Windows title run any better than it did before, it just removes the extra click to try. For devices built around SteamOS, including the Deck and the newer Steam Machine hardware Valve has been shipping, that one less click may matter more than it sounds, given how many new owners arrive from Windows with no idea what Proton even is.

Sources

Image: GamingOnLinux

More news from Gaming World