The folders Originals and Modified should contain image files. Perhaps they are shown erroneously as executable files.
Can you copy them from the disk where they are now to your current Mac to a separate folder in your Pictures folder, where you can change the filename extensions to .jpeg in the Finder? But do not copy them as part of the current file hierarchy, use new, separate folder "originals" or "Modified".
You may need to change the permissions before you can modify the filenames.
You can enlarge the thumbnails from the data folder, using the online image enlarge, see this link: Online Image Enlarger
It can enlarge time images by adding pixels without making the edges blurry.