Learning about iMovie and trying to use conversions of 8mm films

The file clip-135-02-05 05;27;15 would appear to be your old movie ... but it's in an iMovie Thumbnails folder, which is puzzling. I would have expected to find a .mov file that has the same name as its parent folder ... and it wouldn't be in the Thumbnails folder.

For example, if you had created an iMovie project back in 2015 called May Day, there should be a folder called May Day containing the entire project's files including a file called May Day.mov, which would be your finished movie. There would also be a folder called Media containing all the original clips used to make the movie.

Is this screenshot of the entire folder for a particular iMovie project, or just a partial list? If partial, please post a screenshot of the entire folder.

Do you recall what version of iMovie you used back then?