It appears that asf files are a type of audio/video meta-file format in the microsoft family. The audio of an asf file you should be able to play as a wma v9 file but encoding a file to asf is a bit more complicated and I very much doubt it can be done within dMC. I would think that wma should serve your purposes just as well, if not better unless this is part of an a/v project.
Microsoft has some FAQ's in its library re:asf files you might want to check out for more details.
Best wishes,
Bill Mikkelsen
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