Binary (unformatted) files are 100% compatible among all fortran compilers and all c compilers on all hardware platforms. You just have to know how to read them! Some conventions will make this trivial as opposed to a hardship. I regularly exchange data among Sun, Alpha, Athlon, Intel, G4, IBM SP, you name it, and have figured out how to make it work seamlessly -- mostly by using netCDF.

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