All resources need to go into the "files" folder on the project bar, the sounds, music, and fonts folders are not fully implemented yet. The XAudio plugin retrieves resources from the "files" folder. If you want to access resource files outside of XAudio use the Resource Plugin.
EDIT:
It's possible to make your game install your own fonts.
Add the font to the "files" folder of the project bar.
Use the "File" and "Path" plugins to see if the font is in the windows font directory.
If it isn't, use the "Resource" plugin to extract the font and then copy it to the windows font directory.
Then display a message to the effect that a font was installed and you need to restart the program.
Then close the program.
I'll make a cap if that helps.