I have a Dell XPS 12 which came with Windows 8 installed and has been upgraded to 8.1. I know about the Windows/WinSxS folder and its purpose but this system has a second one, Syst0F890D89/Windows/WinSxS, which appears to have far less content, 2693 files. The problem is that my backup program (NovaBackup Pro) can't back up these files and reports that all files are in use even though it has no problem with the normal Windows/WinSxS folder.

I have not found any information about this second folder anywhere and the tech support people at Nova had never seen it before. Does anyone have any ideal about the origin and purpose of this folder?