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#41
Run Disk Cleanup and see if that removes it.
If not -
Other options for viewing drive contents -
MiniTool Partition Wizard
Use the Partition Explore option.
Best Free Partition Manager for Windows | MiniTool Partition Wizard Free
Boot from a Linux Live CD (USB)
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Explore the drive in Linux.
I just "explored" one of my backups. In order to do so, Macrium mounted it. I right clicked the image after it opened in File Explorer, and chose Properties. It was 26.5GB.
I also right clicked and chose Properties on my C: drive... it was 26.3GB.
If you check your backed up image, and your C: drive, and the sizes ARE 19GB different (C: drive being the larger), then all you'd have to do is make a backup and restore from it. That would erase the 19GB file.
Just a thought.
/e If the mounted backup and the C: drive are the same size, then obviously it wouldn't work.
Then I would try making a backup and then immediately restore from the backup, using the bootable Macrium media to do the restoration.
If the C: drive was the larger of the two, then it looks like Macrium will erase that "unknown" file. Ofc, it may come back, over time, depending on where it came from to begin with.
/e I'd test it for you, but I don't have a mysterious "unknown" file.
I know a Linux Live bootable CD or USB can see other invisible files. Like the SAM files, where passwords are stored.
This is quite a mystery. I'm surprised TreeSize in admin mode doesn't identify it. MiniTool Partition Wizard is worth a try - I use the portable version to avoid issues with Defender if you use the normal installer.
Why is your Windows folder so small at 11GB? All my installations have a Windows folder c. 20GB.