Thank you for the answer! But the main problem is the data files open incorrect. Some strange graphics and figures appear when I open my data files...

Hi,

Maybe there is a small change in your original data files you couldn't figure it out. Open a new empty Excell file. Add your file as data not a file. If you click data you will see options: access, web, text, others. When you click text (it is the best fot dat, txt or csv format), you will see a new window such as a kind of editor. If you click next, (2/3) you will see some line between your data lines. You can get moved lines , when you click mouse. If your data or text line is not correct, click the mouse on correct point. Please check next step (3/3) with advanced button for your file decimal system (dot or comma). Good luck.  

Thank you for usefull advise!