Restoring overwritten file on Win8.1

[Junes]

Greetings everyone.

I have a rather delicate issue. Here it goes: I had a Microsoft Excel 2013 file that I had been working on for 8 hours today. When I was done, I wanted to overwrite the old file, which was on a USB drive, with the new, updated one from today. Due to my incredible stupidity however, I overwrote the new file with the old file from the USB drive instead, leaving me with 2 old versions of the file and 8 hours of work lost.

I tried two things:

- Win8 File Restore: You save your older versions of files on an external hard drive to prevent such things from happening. Unfortunately, the next older version is the one from a couple weeks back, although I had been saving the file multiple times during my work today. I suspect that this is due to the file simply being overwritten by the one from the USB drive, which had indeed not been changed for weeks. So where's my older version of the file saved on the laptop, but stupidly overwritten by another one of the same name and content (apart from the progress I made today)?

- System Restore: Unfortunately, my last restore point was yesterday, which was when a program was last installed. And yesterday the file was in the same state as those couple weeks ago. I need a version from today before my overwriting the file though. Is there some genius way to do this?

I can handle many software issues, but I've run out of ideas on this one. If anyone has an idea, I'd be immensely grateful.