I'm not quite sure what you mean, but I have imported avi files before into movie maker and then saved them as wmv.
Most likely because you haven't recorded movies using the ZMBV codec in DOSBox before.
I guessed I should have posted this in General Discussion to get more replies. Anyway, I fixed the problem by changing the codec to something totally different (Xvid/Full Uncompressed RGB) in VirtualDub. Why wouldn't Movie Maker not