hello IQ0 :disagree:
you could try opening your .wmv with avisynth. download it and make an .avs file , and write a line like this:
DirectShowSource("path to your .vmw file")
you can save this file anyware.
open the .avs file with virtualdub
add the filters you need. i strongly recommend you to use xvid instead of divx, with 2 pass enconding.