Automatic addition of TAG data from a text file

Hello again, I'm getting a bit closer! I have copied the mp3 files into Mp3tag, the mp3 filenames appear in the table under Filenames, the most recent modification data appears under Modified, and the titles appear under Titles. I then selected them all and executed Convert Text - Tag. At this point a list of ten error messages appeared in a small box, they were all "Cannot parse line n" where n is a number between 1 and 10. Then I realised I had not told Mp3tag what character I had used as a field separator.
I found a data entry box that requested a filename and a format line - it looked hopeful but when I tried putting the cursor in the latter and pressing the tab key the cursor disappeared and nothing else happened. I closed the data entry box and tried the Convert Text - Tag again but nothing seemed to happen.
Under a settings menu I found something like "Select line separator" but try as I might I cannot find any way to specify the field separator. I have pored over the instructions and help info to find how to do it but to no avail. My gut feeling is that Mp3tag is using a default field separator, it isn't TAB (=chr(9)) and I cannot find a way yo change it. As an aside to that, I cannot find anywhere that tells me what the default is, so I can't even change my Python program to match it.
I'm hoping I can attach my text file and the Preview file from Mp3tag - they both look good to me so I'm lost again! I would be grateful if you could look at them and instantly spot any number of glaring errors... 'Attachments' attached - they don't look like any attachments I've seen before!
Regards, 33-45-78
preview.txt (961 Bytes)
TAGinfo.txt (1.2 KB)