Xbox Backward Compatibility on PC: dataminers discover it's actually a disguised Xbox 360 emulator

Three days after the launch of the program with four original Xbox titles, dataminers found a functional implementation of Xbox 360 emulation in the xefu binary. The catalog is announced to be much more extensive than announced.

The context - case reopened

On July 22, 2026, Microsoft had launched in early release its Xbox Backward Compatibility on PC program, with four original Xbox titles in the catalog: BLiNX: The Time Sweeper, Conker: Live and Reloaded, Crimson Skies: High Road to Revenge and Fuzion Frenzy. Support for upscaling up to 4× the native resolution, PC Achievements to come. In short, a cautious first step, positioned as an Xbox 1 (2001) emulator on Windows 11.

The evolution: what dataminers found

Three days later, as reported by Kotaku on July 25, 2026, the datamining community pounced on the emulator binary (internal name: xefu). Result: the code contains a functional implementation of Xbox 360 emulation, not just the original Xbox. The title of Kotaku sums it up with malice: "Microsoft's new Xbox emulator is actually an Xbox 360 emulator in disguise".

We looked at the dataminers' threads and it blew us away: we're talking about clearly identifiable components of the Xbox 360 system (Xenon PowerPC architecture, ATI Xenos GPU), not anecdotal residual traces. This is active code.

Why this is an event

The Xbox 360 catalog exceeds 2,000 titles (2005-2016), compared to approximately 990 games for the original Xbox (2001-2008). The imbalance is massive - and many major licenses are locked on the 360 generation due to lack of agreement or modern porting: Blue Dragon, Lost Odyssey (the Mistwalker/Sakaguchi JRPGs produced by Microsoft), Kameo, the original Gears of War trilogy...

The fact that xefu already includes 360 emulation mechanically means that Microsoft is preparing a two-step deployment: the original Xbox first (the simplest technical base, emblematic but limited catalog), the 360 next (the real commercial and nostalgic jackpot).

What remains unclear

• The official schedule for adding the 360 catalog has not been communicated. Microsoft may very well wait until the end of the year, or even 2027.
• The list of 360 games that will be offered: the Xbox 360 had 3 SKUs and hardware variations. Not all titles will work out-of-the-box, exactly as on the BC of the Xbox Series X (where the program stopped without having covered the entire catalog).
• The distribution format: Game Pass subscription? Individual purchase? Cross-buy with original 360 console purchases?

Our opinion

This is the best retro news of the year for the Xbox scene, far above the console BC program which had been stalling since 2021. The fact that Microsoft is directly tackling 360 emulation on PC is also an implicit admission: console Xbox hardware is no longer the strategic vector, everything now hinges on Windows.

Note: 8/10 (on the discovery, not on what will be delivered - Microsoft must now confirm). For whom: 360 fans, collectors who no longer have a working console, curious people who missed the 360 era at the time. To remember: xefu is not an Xbox 1 emulator, it is an Xbox 1 AND Xbox 360 emulator with the 360 deliberately limited for the moment.