Originally Posted by Pendergast
The ones that the prscustomizer made, have the ttf icon, but my font has the open type icon
That suggests you're trying to use an OpenType (.otf) font. See Appendix A and save it as a .ttf extension from FontCreator.
Possible problems: (1) Having Windows set to hide file extensions, so what you see isn't the real filename, or (2) Renaming the file, rather than saving from FontCreator, as that doesn't let FC do the conversion that it does when saving.