Headers would need re-formatting, but the main issue is the scale. Tore and I made these at a scale that is only compatible within the Modulex Library itself (i.e. a Modulex Stud pitch of 20LDu), so the parts are not compatible with LEGO System parts. A download of the existing "library" would be possible. I am happy to share mine, but Tore would need to agree for his parts.
Chris (LDraw Parts Library Admin)