[Recuva: recovered files are "excellent/not overwritten" BUT cannot be opened]

I recovered photos from my pc (Windows 10) and saved them on external hard disk, I was so  happy to have been able to recover them, above all because, according to Recuva, their status was "excellent _no overwritten clusters detected", but soon all the happiness has disappeared because  it's IMPOSSIBLE to open them anyway! What could be the reason? Is there a solution? Thanks. Anna

[RECUVA: recovered photos can't be opened even if their status was "excellent/NO overwritten clusters detected"]

Hi, hoping to find a solution... I recovered photos from my pc (Windows 10) and saved them on external hard disk.  According to Recuva their status was "excellent _no overwritten clusters detected" but I can't open them anyway! What could be the reason? Is there a solution? Thanks. Anna