if you only load those file for one time, i suggest you to download Navicat's trial version and load those text into MySQL.
If you are required to load those file frequently, you may not want to purchase Navicat to do so, cos you might think that it is too expensive.
However, it depends on the frequency and your usage of MySQL. If you would also like to administrator your MySQL with a GUI tool, Navicat is definitely a greate choice for you.
with Navicat, you can set a schedule to run the import of the tab delimited text file automatically. besides, there are also plenty of functions available to webmaster like us.
There is a review on Navicat by O'Reily OnLamp.com, you may see if you would like to know more about this tool:
http://www.onlamp.com/pub/a/onlamp/2004/12/22/navicat.html
Here is the official homepage of Navicat:
http://www.navicat.com