When trying to open a file, file permission errors can sometimes be due to a feature of Microsoft NT Server called "Opportunistic Locking". Several web sites also say that "Opportunistic Locking" can cause data corruption.
Here are some revelant links.
http://support.microsoft.com/support/kb/articles/q129/2/02.asp http://support.microsoft.com/support/kb/articles/q126/0/26.asp http://www.acsl.com/DATISpb4.htm http://support.microsoft.com/default.aspx?scid=kb;en-us;296264There also seems to be issues with Opportunistic Locking on Novell servers. However, this should not normally be a problem with Novell systems because the current versions of Netware Client 32 come with Opportunistic Locking disabled by default. See Novell's Technical Information Document on this topic.