I downloaded a set of files and ended up with files with extensions “.ntx”. What can I do about them?
Some posters do very irrational (to put it politely) thing: they first encode files manually with yEnc encoder, than post these files. In the process of posting, their posting software encodes these files again using some other method, for example, uuencode. Then, when you download such files, your newsreader recognises that they are uuencoded and decodes them. But, it is not aware that that was only the second level of encoding. So, what you have now are yEnc encoded files. To get the original files, run yEnc decoder on them. You can download it from here.