Can I stitch together FCPX Output files?

Thank you for responding.

When you’re generating out a file to the drive there are a number of temp files created on the drive. Usually one has the name, but zero bytes. The others hold data, but aren’t launchable. When the process finishes, the program stitches them together into a complete movie file.

I had to update my computer, and this is the first big project I’ve had to do. It’s crashed the Mac twice at 99%, leaving the temp files.

I am fairly advanced pro user. I’m hoping there’s some high level Hoodoo user out there who knows how these files come together under the hood. Perhaps some terminal or compressor way to make them into a working file.