I think if I am not wrong there are two options.

One open your Music Maker and if there is only one track to export means on track number one you got one track. Look at the extreme left there will be Icon showing Drum, Bass or else if you change text from Drum to your etc. that might be included in the exported file. As I did these kind of experiment in past and right now can not use my music maker therefore please try. Or if you got more tracks such as 1 to 9 you wanted to export in a wave file. Export that track. Then use file browser locate this file drag and drop on the arranger. You should got only this file on the track. Now look at the extreme left where normally you see icons of Drum, Bass, Synth etc. In the first track give any name and re-export it must contain the name.

Another method when working in Music Maker open external editor that will be Music editor or after exporting your audio file open Music editor and import your file and try to add text using CD/Text editor. I do not remember if that is for CD making or if we can also apply on single files. Refer screen shot how it looks.

Sorry you got to check yourself.

nihon94

-----------------------------------

Additional:

Further to your question.
Now I can use Music Maker, I found out during export if we select WMA fomat in that case we can add some information.
Click Advanced, click on Clip info and fill in click ok and export. You can refer screen shot.

Also I got Tagscanner a freeware utility to edit text information of the audio file. I imported my experimental wma file click on Tag Editor and you can see it is showing information on the right side.

I am also giving you link to download Tagscanner if you wish.
http://www.softpedia.com/get/Multimedia/Audio/Tag-Editors/TagScanner.shtml

nihon94