questions on file formats

[Dave Pesner]

Does FreeBSD support the .DMG file format?  I need to know this
because I'm looking for a free alternative for an OS X emulator and a
liscensed copy of OS X(isn't open source software great) for my next
computer.  If BSD does support OS X file formats such as DMG, great. 
If not, please suggest a free UNIX based operating system that does,
and works with AMD64.
Thank you for your time.