Avoid BMP in export

Hi all...
My first post here <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=10052&image=1&table=forumtopics' class='bbc_emoticon' alt=':)' />
I have a field in my database that contains a bmp file for each posts.

What I want to do, is to avoid the bmp field to be exported together with the other data.
Example:

• Have done a search
  
• Want to export the data to a *.csv file.
  
  What happens next, is that the fields containing the bmp messes up the export... <img src='https://asprunner.com/forums/file.php?topicimage=1&fieldname=question&id=10052&image=2&table=forumtopics' class='bbc_emoticon' alt=':blink:' />
  How can I avoid the problem?
  I'm running:
  
  Latest PHPRunner
  
  MySQL 5.0.51b
  
  PHP 5.2.6