Removing Header from a Flat File

Hi,
What would be the most efficient method to remove a line from a Flat file?
Suppose i have a flat file with a header record followed by multiple data records. And i want to strip off the header before passing on the file to the next system. How can i do it without parsing through the complete file?
Is there an efficient way to just peek in the file and remove the header ?

Thanks & Regards
Shantanu