Extra prompts from Excel 2007 after saving a CSV file

[google_poster]

Here's the scenario:
1. I open a .CSV file in Excel 2007.
2. I make some data change to the file.
3. I save the file. Excel prompts me to use the CSV format again.
This is a little annoying, but I answer Yes, I want to keep this
format.
4. I try to close Excel.
5. Excel prompts me with "Do you want to save the changes you made to
'(filename)?' Yes/No/Cancel.
This is INFURIATING. I just saved the darn file. So I click No,
thereby training myself to click no when prompted by Excel to save
changes, guaranteeing I'll lose work in the future.
Does anyone know a way to get Excel to only prompt if there is
actually something to save in this case?
Thanks,
Bob