Microsoft confirmed reports that some Windows 10 source code has leaked online.

The company said that the leaked files were a portion of the source code from the Shared Source Initiative and is used by OEMs and partners.

The source code appeared at the Beta Archive website, and the FTP folder that was stored at has now been taken offline. The folder was 1.2GB in size, contained 12 releases each being 100MB, according to the website.