I think you should change the default program to edit MTE files to a plain text editor - a spreadsheet is definitely not the best application to edit it.
Also, a screenshot makes it much more difficult for us to supply you with a modified script that you can transfer to your installation. I would actually not spend the effort to re-type the script over here.
You can edit this export script and add all the fields that you like , in your case add %bpm%; in the line that starts with $loop.
I would also edit the script to such an extent that I would remove all the superfluous fields that apparently have no data. I assume that these are ALBUM, TRACK and YEAR.
And finally: you would have to modify the way that you open the csv output and open the CSV file as an import from within the spreadsheet program where you can set the file type. Otherwise, you would not get the input separated into cells.
As suggested by @ohrenkino you should change the default program for opening mte files to something like Notepad or Wordpad.
The first line of your file shows the headers for the output. These are just text names, separated by a semicolon. You can add “BPM;” to the end, or insert it wherever you prefer within that line.
The second line is the loop that grabs the actual data from each file in your list. Again separated by the semicolon in this case. You would have to add the field name “%BPM%;” to the end of this line as well, or insert it between whichever fields you did the same for the titles in line1.
Make sure you save the changes before exiting. And consider using a new filename so you can have both options.
By the way, if you are using Excel to view the resulting csv file it should be opened from within Excel. That will open an import wizard so you can confirm the data types for each column, and even the separator character you choose. The default semicolon can be changed in the mte file to something less common, especially if you have any semicolons in some of your metadata already. Mine is set to the § character since I do not use this anywhere else.