I am actually currently trying to usr Recuva for the first to recover a corrupted file that happened, it seems during Win 10 update. What you describe concerning a file that seemingly exists on the file system but in practice there is no access sounds just like your situation. From my limited understating, I think it is because there is an entry in the MFT - an index of all the files there are - with the file physically deleted.
So the question is, can Recuva recover such a file?
Lucien (if you're still with us), files that are marked as overwritten are overwritten by a live file, there is no concept of being overwritten by a deleted file. So your hideous images must be live, somewhere on your disk. Recuva will tell you where they are in the Info pane.