Hi you,
You're right to avoid these files! They're junk. More & more of these are popping up all the time. If the file size doesn't look right, don't attempt a download. Also, stay away from files named all in capitals L_I_K_E T_H_I_S.

There's a sticky in the Download/Upload Problems section - Major topics for download/upload help. Within that you'll find info about corrupt songs, bitrate versus file size, T3 spammers. Have a read of it