@lololulu19:
Nobody even uses screen savers anymore, so there is no good reason for SCR files to exist. Anybody posting an SCR file should have all their previous uploads "examined"
Unfortunately, .scr also stands for a Windows script file–meaning it's essentially an executable file (like .exe) but it will bypass most anti-virus checks or even a dialog box asking "Do you really want to run this file?" They are super-dangerous and downright malicious. People who upload these should be permanently banned from the site.
In an ideal world, the gt.ru software would block any torrent containing such files--but I can imagine that putting in a patch like that would be time consuming and risky. Software is often like a house of cards: Fixing one piece of it can have disastrous results on the rest.