txt files appear as black on white background
 

Hello. Some time a go i got an mp4 player that looks just like Vidego 2.8. The player works just fine and its branded E-tech Itouch,also for some reason, the website isn't working anymore :|. My problem is that when i 1st got it,it had a sample text in it and it was displayed as white text on black background. Now,all my txt files appear as black on white and I want to change that,the only problem is that i can't find the place to change that :| I looked everywhere but couldn't find anything. Can anyone help me? Thx