Good free/share-ware charting program for very large data files?

Hello,

I have several large data files in CSV/ASCII format, for 1 minute intervals it takes 110MB and tick by tick takes 1.7GB.
All I need this program to do is just display it on a chart, zoom in, zoom out as much as necessary and have covenient browsing/scrolling, other features are optional.

Can you recommend me any such program that would easily handle large data files?

Thank you
 
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