How to get leading zeroes in exponent of e-format

In order to mimic an ancient file specification, am trying to write DBL numbers in e-format where the exponent is padded to two digits with leading zeroes.
For example:  -1.15091E-03
Is there a simple format code that does this or do I need to write something from scratch?
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I am writing to a file.
(Currently, I use the following workaround: format as %12.5e, then scan the substring after the "E", format it as %+03d, and recombine with the mantissa)
LabVIEW Champion . Do more with less code and in less time .

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