So the problem its that I lost the file the problem is that its not the right version. The last thing I did on the file was make some edits to some sections of the video and render those sections(don't know if this matters but the name I called the render was different than the name of the actual file(I have no clue wat it could be at this point)). I've ben working on other video's recently so I haven't opened the file up in a while and wen I did it didn't have the edits I made, I've saved the file multiple times and have open and closed it before with it still being there. I did get a new hard drive but that was a few day after I stopped using the file I think. I use Sony Vegas 14 Edit (Steam version)on Windows 10.