I had a file sent to me in GEDCOM format that I'd already opened as a new database rather than into an existing one. I now want to add that to another file. So as not to confuse myself (so I thought) I followed instructions on the help page and exported one to a new folder then imported the other into that one. As there were now over 1500 individuals in the dbase I knew that bit had worked and that I now had loads of duplicate (and some triplicate) individuals. I then started what I presumed would be the simple procedure of matching & merging. Trouble is I just get a message saying Cannot Open Merge File. Help! (in simple language please).