The extension XPT has no fixed meaning. So it MIGHT be a file in the SAS V5 Transport format that can be read with the XPORT library engine. But it might be a file created with PROC CPORT that would require using PROC CIMPORT to read. Or it might be a SAS V7/8/9 Transport file create by the %LOC2XPT() macro in which case you would need to use the %XPT2LOC() macro to read it.
I don't use JMP, but perhaps the information that it can be imported by JMP would tell someone that is familiar with JMP what type of file it is.
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