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I have never tried, but I think it uses off_t and size_t where needed. If you want to try it, edit the source file libsrc/mmapio.c At about line 170, change if(sizeof(void*) < 8 && fIsSet(ioflags,NC_64BIT_OFFSET)) to if(sizeof(void*) < 8) Rebuild and see if it works for you. Let me know. =Dennis Heimbigner Unidata Ticket Details =================== Ticket ID: RQG-223910 Department: Support netCDF Priority: Normal Status: Closed