How I got the point is long story...while making a new triple boot win, Mac, Ubuntu computer.
I repartitioned both the HD as well as external HD and then copied new folders from a server onto the newly formatted exfat data drives.
The disk recovery expert could not find the FAT / File structure because of the overwriting. What I have is a dump with random alphanumeric names, but with file extensions.

I have folders of doc, docx, ppt, pptx files with extensions...so there is hope. There are thousands of files, some duplicates as well . Naming manually is an onerous task. I need help in automatically finding titles of ppt files, or initial strings of doc files and renaming files as per those strings .