hi PuppyBaby,
Welcome to the site..
More then likely the files your trying to share are ripped with Windows Medai Player.. and if so they have an extension of
.wmaWinMX can be forced to share these file but doesnt by default for a good reason, at one time and as far as I know still does, Windows Media player inbeds information about the users PC in which the files where ripped from. Now not your avg person will notice this, but like I always say...
If I can find it so can the experts .. so for that reason we recommend that you either re rip your files with something such as C-Dex or other ripping software
https://www.winmxworld.com/tutorials/cdex_ripping.html - This program is free btw..
Or you can still share those files by forcing WinMX to share that file type .wma
For version 3.53 go to your Shared Files page, click on File Types and add this type in the same format as they have the others .wma
For Version 3.54 go to your Settings > Library and add the new file type there.