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Connecting the dots: Microsoft is asking creators to swap their MacBook Pros for the new $2,600 Surface Laptop Ultra. So it's awkward that the wallpapers it just shared with Windows Insiders appear to have been saved in Photoshop on a Mac.

Most image files carry a small tag naming the app that last saved them, buried in a properties menu that few people ever open. When a Windows developer checked it on Microsoft's newest wallpapers, it pointed to Photoshop running on a Mac. The company has since swapped in cleaned-up copies.

The wallpapers went out by email in mid-October as a thank-you for 12 years of the company's early-access Windows Insider Program.…