In Microsoft Video Maker you can use the File ► Save movie function is then possible to export only the audio from the WLMP projects as WMA. There doesn't seem to be any other way how to perform this conversion.
Convert Microsoft Windows Live Movie Maker video project to Windows Media Audio.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert wlmp to wma on Windows
Microsoft Windows Live Movie Maker is proprietary video editor for Microsoft Windows. It is able to add Add special effects, transitions, sound, and captions to edited video file. Final video can be shared on Internet or burned on DVD.
Convert from wlmp file
to wma file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.