Yes, you are correct that simply changing the file extension from .csv to .asc will not convert the file to ASCII format. Here are the steps to correctly convert a CSV file to an ASCII file:

1. Open the CSV file in
   Formula:

   Excel 2007 

   .
2. Click on the "File" tab in the ribbon and select "Save As".
3. In the "Save As" dialog box, choose a location to save the file and select "Text (Tab delimited) (*.txt)" from the "Save as type" drop-down menu.
4. Click the "Save" button.
5. In the "Text Import Wizard" that appears, select "Delimited" and click "Next".
6. Check the box next to "Tab" under "Delimiters" and uncheck any other boxes. You can also choose the text qualifier if your CSV file contains text fields with commas in them.
7. Click "Next" and then "Finish".
8. Open the saved text file in a text editor such as Notepad or WordPad.
9. In the text editor, click "File" and then "Save As".
10. In the "Save As" dialog box, choose a location to save the file and select "ASCII (DOS)" or "ASCII (Unix)" from the "Save as type" drop-down menu, depending on your operating system.
11. Click the "Save" button.

Your CSV file should now be converted to an ASCII file. Keep in mind that ASCII files do not support formatting or formulas like Excel files do, so any formatting or formulas in your original CSV file will not be preserved in the ASCII file.