Did I hear someone mention me?
Ok seriously:
It is dead easy to save a text file from excel, although it depends on how you show your data in the excelsheet.
Basically: When entering an entire line of text in one single cell, you can just save the excelsheet as a unicode text file and you will have a perfectly matching textfile. But If you are showing more in the sheet, big chance that you will encounter problems since the content of the cells are seperated by tabs by default. See the attached example to see what you get when exporting the example xls file.
But unless I misunderstand, and depending on how far you want to go, I am wondering why you want to use excel to export the data into a m3u file. Are you using an ADO connection in VBA or the database option within excel itself? Could you present a dummy in order to understand what you want to do? I'm afraid that if you don't , my answers might only complicate things for you.