What are those huge one-letter files in Windows folder?

I used WinDirStat to display my hd content to find what take so much space. I found that there are five files of 15.9 GB in C:\Windows folder.

Does someone know what are those files? Can I delete them?

Michaël

Posted 2015-12-10T08:44:15.657

Reputation: 123

They all have a S flag meaning they are system files. Mess with these at your own risk! – Burgi – 2015-12-10T11:10:54.010

@Burgi I know what S stands for. S=System, H=Hidden and A=Archive. But this does not explain me what are those files that are using almost one third the size of the hd. – Michaël – 2015-12-10T12:19:51.243

use TreeSizeFree (started as admin) instead, it is much better: http://www.jam-software.com/treesize_free/?language=EN

– magicandre1981 – 2015-12-10T16:31:19.140

Windows 7 sometimes downloads files needed to upgrade to Win10 without the users permission. Those files might be related to the upgrade. – Madoc Comadrin – 2015-12-11T07:48:44.023

@MadocComadrin So now I am stuck with 80 GB of useless files. Because I won't upgrade to Windows 10. – Michaël – 2015-12-15T07:15:11.970

If you have recent system image as backup you could try deleting them. If something bad happens just do system restore from the image. – Madoc Comadrin – 2015-12-16T06:28:18.490

What are those huge one-letter files in Windows folder?

No answers