Fantastic thank you. nstore() seems to allow exchange of storable files both ways round from 32-bit to 64-bit and vice versa, and there appears to be no performance or file size penalty with nstore() vs store().

The only thing that would be better would be if retrieve() were able to use the 'longsize', 'ptrsize' and 'byteorder' values from the header and interpret the file appropriately. That would assist me with the thousands of store()'d storables I already have.

Cheers,
Mark