Why does not the Paradox for Win 4.5 run correctly under WinXP Domain Environment? I can get it running under Administrator account but if I change to normal account it says something like "Could not find c:\pdoxwin\private\_q51yd8.ftl". All users have full rights to every pdox directories...

It's because they don't have enough rights under XP. They literally have to have admin rights for the private directory. Before you ask, I don't know why - XP is quirky like that.