An N64 emulator app for Xbox One was released and then quickly removed from the console's marketplace.

Word of the app - named Win64e10 - spread yesterday via Reddit, although it had actually launched quietly over the weekend.

While available, it cost £7.69 to buy Win64e10 in the UK.

The app was hidden on the marketplace as it had not received a Microsoft-approved release - but was searchable by name if you knew of its existence.

Microsoft obviously took note of the launch: the app is no longer available to buy now.

Regardless, anyone who did hand over money can still use Win64e10.

The legal grey-area app works by loading almost-certainly illegal ROM versions of games downloaded from the internet which you then copy to OneDrive, Microsoft's cloud-based storage system. You can then re-upload the files after playing with your latest save data.

Various videos exist on YouTube showing the emulator in action - it seems to work just fine.

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It's not the first time an emulator has appeared on the Xbox One store - a NES emulator popped up earlier this month.

Microsoft updated Xbox One's firmware over the summer to technically support any Universal Windows Platform app from the Windows Store - although the company is clearly taking a far closer level of control over which apps get a formal Xbox One release.