Thank you for your fast answer. ;-)

"Hum, you *only* want to list rm files bigger than 
500K?"

Yes. ;-)


"Extract URLs from the logfile." 
That's exactly what I don't know how do quickly. I 
know how to do it one url after the other (copy and 
paste in a new text file). But as there are more than 
500 ".rm" files (each one bigger than 10 Mo), it will 
take me a lot of time. ;-( 

Any ideas ? ;-)
Many thanks in advance,
Pbram