hi alistu,
Well i would like to mention that this problem does appear in many cases. You rightly said some .osd files from the forum which are being implemented in Optisystem version 7 are easily accessible while some do not open. But if you try them opening the same .osd files on Optisystem 7 , there they work fine. So i guess there is issue with the updated tool which sometimes does not allow us to open the files.
Regards