I've sorted it out, I realised I had to use file restore not open file.
My old computer died so now I have reloaded RM 4 on a Vista laptop, my previous was an XP. I've successfully reloaded the program but I'm having problems getting the saved databases loaded. I have them saved on a memory stick, but copied them to my computor. I then had the program search for them and clicked open, but there is no data showing, just a blank tree waiting for data to be input. What am I doing wrong?