Recuva missed some files

Hi!

I used Recuva v1.51 (downloaded it yesterday) on a disk volume. I recovered the deleted files that had State: Excellent, then, to a different folder, also the non-deleted files.

Later I noticed that some files are missing. The original disk volume has some folders and files in \Program Files\Common Files\ but in the recovered files there is no folder "Common Files".

I did not set any filters.

Any idea what might have happened?

Regards,

David