So I ran TestDisk and 100.000+ files were undeleted to an external drive. Looking at it, all seems normal... filenames, extensions, date of last change, size, etc...
I just can open any of them. Many are .pdf or .docx and no of the viewers/editors I have will open the files.
Have I done something wrong during the extraction or is there some trick to get it all un-corrupted?
Afterwards I tried running PhotoRec on the same disk on the unallocated space. It gave me half the files in a bunch of folders, some working... sadly not the ones I really need!
... and now the sad story that started it all. I delete a user account on a windows 10 system but didn't save the data first

Hope someone has some insights!
Thanks in advance,
Best,
Lars