Thank you for the suggestion old-polack, unfortunatly no luck. I have renamed the folder from "blandet" to "mixed". At the same time I created a new empty subfolder from Windows, this is not seen in PCLOS either. I have also tried to open the folder as root, no luck.
I have to modify my first post, because creating a new folder and copy the files to that one in XP, does not make the files viewable in PCLOS on the local partition, only on the external drive.
I have now also tried to create a new folder in PCLOS, reboot to XP, copy files to the folder, reboot to PCLOS. The files inside are not viewable, only the folder and it's properties which are exactly the same as all other folders that works fine.
Even more strange is this; If I in PCLOS copy new files to the folder, I get no errors, but I can still not view the files. If I then reboot to XP I can see the new files that I copied to the folder with PCLOS, so they have been copied with sucess.
So I dig that it is either a problem with PCLOS and the NTFS filesystem - or it is a problem with the file table on the partition. Can I in any way force a check of the disk with PCLOS, and do that without risk of loosing hte files?