Your file: ltd-addcompany-01.txt starts with <? but doesn't end with ?>. You want this:
Also, in ltd-addcompany-02.txt it looks like you comment out everything except where you initialize your variables.
Looking further, there is more wrong than I first thought. OK, so ltd-add-company-01.php, you don't need to enclose all the html in <?php ?>. If you do you need to echo the html. If you don't you need to enclose the parts that are php in those tags. Also, your <head></head> tag is missing which should be telling the page where the script is located.