Tell "miger" to log in here into the Mp3tag forum, there might be other users willing to help on basic user level.
There are several different methods around here on the board to construct a save line format of CSV/SSV/TSV or such other delimiter character.
I like to use a pipe symbol as delimiter and double quotes to enclose literals.
Others like the star symbol as delimiter, because the star symbol is a forbidden character on file system paths.
Take into account, that the excel setup and understanding of what is CSV and what is the delimiter is system language dependent.
Wikipedia has good info about CSV:
German
http://de.wikipedia.org/w/index.php?title=...;oldid=71045982
English
http://en.wikipedia.org/w/index.php?title=...oldid=345909462
See also:
CSV output
[LP] CSV export fails on value containing semicolon
character set von csv
Export CSV
Import tags from text file
DD.20100315.1736.CET
... and by the way .. it looks like that your pupil cannot work with Excel. He does not know how to save the excel worksheet as other format.
He tries to simulate CSV by inserting new columns into the worksheet, which cells contain the delimiter character. Therefore it is possible that he creates much more fields in the export line and runs into trouble over trouble.
Tell him to use simple notepad and guide him to reach the goal basically with one correct formatted CSV line.
If he got one line working, then millions of lines will work.
DD.20100315.1748.CET