Keyword EXTFMT is specified for a type that does not allow it, or with an incorrect parameter.
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Cause . . . . . : Keyword EXTFMT is only allowed with numeric arrays and UCS-2 arrays. For numeric arrays, external format C is not allowed. For UCS-2 arrays, the only valid external format is C. EXTFMT keyword is ignored.
Recovery . . . : Remove the EXTFMT keyword, or correct the parameter to keyword EXTFMT. Compile again.
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