Dear @Dalini,
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The sum.lis files are already in ASCII format, no further processing required.
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In the sum.lis file you find the line Tot. resp., which is the total response (integrated) value across the whole energy range.
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The Flux is the actual d\Phi/dE [1/cm^2/GeV/pr] value of the actual bin, while the Cumulative Fluxes are the integrated values between E_{max} and the lower energy of the actual bin. The cumulative fluxes are starting at the highest energies, going down to E_{min}. Note: The last cumulative flux value equals to the total response.
Cheers,
David