Oki, my error.
I just bought an extension db9 cable... and in the package one could read "VGA extension cable DB9M-DB9F"

So, how can we trust those guys ?
One can always make his own Xtension cable... Just getting a db9m and a db9 f conectores, and solder an apropriate cable tehre.
Anyway tkx for the info, Itdannear