Frank, what do you have available??

Do you still have your project directory

in my documents\incomedia\website x5 v12 - Evolution\project name?

Inside the project name folder, is there a backup directory?

(this may only exist if you used the built in FTP to upload the website to the internet)

Hopefully the backup files will look something like this

Pick the most recent one and copy it up to the project directory.

Rename project.iwprj as project-broken.iwprj and rename the backup as project.iwprj

Now run WX5, cross your fingers and see how you get on.

If the first attempt fails, try another backup.

You say you have a copy, is this the original project directory with all files and subdirectories or merely an export of the website that can be opened in a web browser? (sadly this is of little value). If it is the original project folder you could rename your existing project folder and copy the backed up project folder into the website x5 v12 - evolution folder

If you have no joy (and no other backup options), then JJ is correct.

Good luck