Thanks so much for reaching out. I have both Lectora 16 and 18 installed on my work P.C. Windows is configured to show all file extensions.
I followed your steps.
1. Copied the folder with the .awt file and all supporting files to a new location on my PC (and created a zip file).
Unfortunately, all I have is MyTitle.awt. There is no file entitled MyTitle.awt.16.2.2. All that exists in this copied folder is Mytitle.awt and MyTitle.awt18.2.1
Looks like Lectora 18 gobbled up everything and left no backup of version 16.2.2!