Why won't iTunes convert my wma-files?

Good evening!

I have a problem with getting iTunes to accept my movie wma-files. (I asked a previous question regarding using QuickTimePro for convertion but I was enlightened by the fact that QTpro doesn't accept wma-files on a pc (well that was money down the drain..) So now I'm trying my luck under the iTunes section.)

However, iTunes is suppose to convert wma's automatically, is it not? Why is it that when I try to add them to the library through Files or drag'n drop them, iTunes doesn't react at all? No error message or anything. No convertion either. -.-

They are not protected files as they are homemade in Windows Live Movie maker. I have a pc with Windows 7 64-bit and everything seems to be updated...

What to do...? Thanks for anything that can be helpful! :-)