Hello Naomi
Thank you for your quit answer.
I took a look at the threads/messages you hint to.
I found no solution. My problem has nothing to do with hidden directories.
For example:
I can find the needed informations for all files in d:\myfolder\ incl. all subdirectories
Exeption: all files in d:\myfolder\album3
I created a new directory d:\myfolder\album_test and copied all files from album3 into the new directory.
Same error! So it must be something with the files, but i can find special file attributes that are different from the one in ...\album2 ??

Best regards
Albert