Open full project in Protel 99SE

[Giblets]

After a couple of years break I'm layng out a board using 99SE and have a
small problem...

I have a multisheet schematic, each schematic is referred to from a xxx.prj
project schematic via a sheet symbol. I'm having problems where some sheets
are not being included in the netlist.

Also when I open the xxx.prj file the included schematic sheets do not open
automagically. I remember a tick box somewhere to "enable opening of all
project files" or similar but cannot find it anywhere. How do I do it??

thanks