I have VirtualDub 1.3c and I want to convert an ASF file to Divx with it. I tried to open the ASF file but got this error:

"Couldn't locate decompressor for format 'MP42' (Microsoft High-Speed MPEG-4 V2)"

For info, the file runs well, I can watch it. And I use Windows 2000, in case it's needed. I think I have to install some sort of codec but I have no clue what to do. Can you help me with this?