Yes, I have Been Using Limewire For A LONG TIME NOW and after you use it for a while You get to know the Virus Files By Size,Something to remember as MY rule of thumb is MOST ALL PROGRAMS are going to be Larger that 851mb
I usually will not download a PROGRAM file unless the size is ATLEAST 4 digits long.Most(and note I siad MOST)of the virus files are between 150 and 851 kb in size