Thanks for your reactions.
-I copied files devided over a few sub-folders from one folder to another (on the same drive)
-After the copy was ready, I unintendedly deleted the original folder with Shift+Delete.
-Because during the copying some new sub-folders were created and others were merged, I couldn't easily see whether all files were copied correctly.
-The plan was compare a "new" or merged sub-folder, with its original, and when the files were all there, permanently delete the original.
-However, at one moment I wasn't aware that not the subfolder, but the "parent-folder" was selected. And so I permanently deleted the complet folder.
On itself not a big issue, as I had allready copied its contend, however out of habit, I pressed Ctrl-z.
-Because the "Shift-delete" can't be undone, Windows reverted to the latest action that could be undone, wich was The copying....
So the 'Complete original "parent-folder" was gone and the copies as well!!!
I do know "Shift + Delete" wasn't my brightest choise, it was more out of a habbit, but I can't undo. (Just learn) My "Ctrl+Z" reflex, exact same story....
I was "helping?" my friend on his computer, so the files are really gone.
Windows was online at that moment, and I do expect it was downloading updates in the background, which explains a lot.
It even did some updates yesterday dispite I disabled Windows-Update. (I set its startup-status OFF, and never pressed 'update and shutdown/restart')
Today I opened the .jpg's in a "file editor" and it's clear that the majority of code lines are gone (see picture).
Only some data on camera, objective, aperture, date, etc remain.... Something I find very odd, is that all the files are almost identically damaged. Something I wouldn't expect. I actually expected, the files to be all differend affected after some overwrithing.
Based on the code lines, I think it is quite fair to say these files can't be repaired...
Maybe I should consult a professional recover-company...
Thanks again for your reactions.