recover file after reset sandbox?

Hi, I accidentally delete the folder Vtroot that contains a word file I was working when I reset the sandbox.
Is there any way to recover this file or is permanently lost?

You could try a program like Recuva to try and restore the deleted file.

I did but fails to recover the version that was inside the virtual folder.

Could Recuva look into the VTRoot folder?

Yes, but I managed to recover only the old version of the document, not the last one with which I was working.
What happened was this: I was working with libreoffice 4 which was on the hard disk, upgrade to libreoffice 5 which was installed sandboxed without warning.
So I lost the part of the document worked in the 5.