jRRD attempts to determine the platform the RRD file was generated on. The latest version has been tested with
- RRD files generated on Linux (x86 and x86_64), and Sparc Solaris.
- RRD files version 1 and 3 (there's no version 2, version 3 is the latest) 
Don't hesitate to give us feedback on other plateforms, sample rrd files would be appreciated. Fill an issue for an unsupported plateform and don't forget to supply a sample file too.