deleted project file recovered but it is not readable

I have been working on a project for several days. One day,
while I was working, Hitfilm pro started to crash. So, when i reopened hitfilm,  
a window opened and asked me if I wanted me to recover the open file backup previously.
I answered yes and I thought it was going to happen as usual so I replaced my old backup
but just after, a new window opened and said hitfilm could not get the backup ... so
just after I deleted my other backup.
But I managed to recover the project file erased through a software except that when I want to read it,
hitfilm pro tells me that it can not read the contents of the file.
How should I get hitflim to read it?