First, has anyone used a pocket logger?

Second, and if not, I have a lot of archived data in .pl1 and .pl2 format which can be opened in Excel.

I would get 3 columns of data.

Everything was stable with Excel 2003 and with Excel 2010. But I did something, and I don't know what, and now these supposed three columns of data are read in one column separated by two commas.

Does anyone here understand why this happened? What can be done to reverse this effect?

Your help is much appreciated.

Thanks!