Microsoft has made a notable mistake in the latest test version of Windows 11. The company accidentally replaced the operating system’s startup sound with the characteristic startup sound of Windows Vista, which was released in 2007. The mistake was revealed in Windows 11 Dev Channel preview build 26200.5651, which was released last Friday.

Windows 11 has become a hot topic with a major bug

Windows testers using the developer version noticed that they heard the familiar melody from the Vista era instead of the familiar Windows 11 sound when they started their computers. It was determined that the .WAV format version of the sound file in the “imageres.dll” file had been replaced with the one in the Vista version.

Microsoft quickly confirmed the bug and added an official statement to the Windows Insider release notes regarding the incident. The statement said, “This week’s release includes a fun nod to the past and starts with the Windows Vista startup sound instead of Windows 11. We are working to fix the issue.”

Brandon LeBlanc from the Windows Insider team humorously addressed the issue in a post on social media platform X. “I played around with Windows sound files a bit and thought people needed a breath of fresh air,” LeBlanc said, confirming that this was just a software bug.

This sound change, which only affects Dev Channel users for now, will be fixed in an update in the coming days, according to Microsoft’s statement. Until then, users will continue to be greeted with a nostalgic Vista-era tune every time they turn on their computers.