MS Office 2010 password-protected files seem to work great with LibreOffice, so we’re going to recreate the problem documents in MSO 2010. It appears the problem files were created in MS Office versions earlier than 2010.
mariosv, I’m totally confused by your comment “And please this is not a for free support service.” To me help=support. Doesn’t matter now as it is not relevant to the answer.
edit: I cannot accept my own answer as the best answer because I don’t have the requisite point total. Hopefully I do not keep getting reminder emails to Accept the Best Answer when I cannot do so.
second edit: I keep getting emails from this site asking me to accept the best answer, but my own answer is the best answer and I cannot select my own answer because I don’t have enough “points” according to the site. Can someone stop this madness? I don’t need to keep getting nag emails from this site for something that is beyond my control.