This is not what you have asked but there is option in user interface preferences.
Menu > Preferences > User Interface (Ctrl+2), where you can change the theme type (which also includes system font).
There is no direct option within NX to change it's font. If there is any way by editing any NX file, someone will surely suggest/mention it.
Just to make it clear:
1) Are you asking how to change the font in the menus & NX dialogs?
2) Or are you asking to change the fonts used for drafting/modeling/PMI?
Note the menu/dialog font on unix / Apple computers *I believe* can be controlled (or used to be able to be controlled) with an X Windows resource file (or whatever it is called).
This (to my knowledge) was never implemented for MS Windows (other than what others have already suggested)
Production: NX10.0.3.5 MP16/TC11.2
I'd rather be e-steamed than e-diseaseled
thanks for the suggestion,
I wanna only change only NX fonts, but I think now it's very difficult, not an issue,,, thanks for the help again all guys