Importing data to WD

Hi, Guys

I have a Davis Monitor II and, in theory, I can download from the PClink a so called download.txt file, in order to use it as data for WD, right? Well, I have the weather station since 1999 but only use WD since early 2003. Am I thinking right if I believe I can import 1999, 2000, 2001 and 2002 PClink data, step by step, with download.txt file? And how? In a monthy way, but giving to each different file the same download.txt name? Another issue is that I already tried, recently, to import recent data (about 24 hours of data) by this method, but in WD the data was not quite similar…

Thanks for any help I can get.