found a solution that I'd like to share in case someone's looking for an answer one day:
"pro" option: Quicktime Pro and Flip4mac. Download F4Mac for $175 and once you open QT Pro you'll find an option to export wmv.
Then you'll enter the joy of customizing with endless of options: VBR, CBR, constraint, one pass, two pass and millions of combinations
AVID on a PC option.
At Export you'll be able to find a Windows option but with very limited options that gave me a below average result.
iSkysoft, free software, limited customization options... but free.
Hope this helps