Quicktime File Was Changed From MPEG-4 to nothing?

Hey folks,

So I did a couple interviews this past week, and the recording's files seemed to have been somehow modified, and lost the bulk of the recordings.

Here's the file info now:

So it says the file was modified last night, which doesn't make sense because I wasn't on the computer then. And now the size of the file is tiny compared to what it should be.

Does anyone know if there's a way to revert the file to what it was before? Thanks!