It all depends on the structure of the .dat file. If the data is simply tab-delimited text, importing it into any of the environments you specified should be a snap.
One thing you can try is make a copy of a .dat file and change it's extension to .xls. This tells Windows that it's an Excel file. Now try opening the file by double clicking it. If the file is tab-delimited text, you get a dialog box from excel for importing the data and it will open with the data in conventional rows and columns.
Alternately, you can change the copy's extension to .txt and try opening it in Notepad. If you get reasonable looking data, it's text data of some form. Note that in addition to using tabs to delimit data values, other common text formats are comma-delimited and fix
ed-length fields.
If either of these tests fail, the file have some other format and you'll have to get with whoever developed to LV code originally to see how they formatted the data.
If you post one of your .dat files I would be glad to look at it for you.
Mike...