Not just NTFS, but pre OSX Macs would do stuff like this. Like a formatted document would have a text/plain fork, and the formatting information in another fork. Or an executable could keep it's symbol table or relocation information in other forks.
I've tried it with ancient font suitcases -- the ones that pre-date dfont (data fork only) fonts.
It's somewhat ironic that all desktop file systems these days support myriad data streams on a file. I've implemented some on NTFS, played with extended attributes across tar archives between Linux and Mac and Windows. It's all there, but no longer used.
