I apologize everyone, now I only realized that I made one more maybe crucial mistake. The thread name and all the words "DOC" should actually be "TXT", everywhere I meant txts...
I think I did the mistake one of the reason because on my kindle, all the txt files are labeled "DOC".
Anyway, the point in brief was, if I am able to scroll left and right in such files the table, why it's not possible to scroll up and down and why not to ask Amazon if they could see if the reason is an easy thing to fix.
The conversion although seems like a good idea, because the file weight is the same, it's not so good(easy) when there is hundred of files, spread in hundred folders and subfolders.